15 Biggest Unsolved Anime Mysteries

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Anime is known for its intricate plots and diverse ideas, presenting mysteries that leave fans theorizing long after the series has ended. These enigmas range from unexplained plot points and character backgrounds to symbolic representations and philosophical questions.


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Whether intentionally left ambiguous by the creators or simply left unresolved, these mysteries make the story more engaging and thought-provoking. From the nature of the One Piece treasure to the source of Saitama’s strength in One Punch Man, these puzzles continue to captivate audiences. The biggest unsolved anime mysteries have become iconic within the medium, sparking debates, fan theories, and detailed analyses.

Updated by Dev Tugnait on December 17, 2023: We have refreshed this list with five new entries. These additions showcase the captivating world of anime, exploring more mystifying plots and characters that continue to spark debates and theories among fans. Dive in to explore anime’s biggest unsolved mysteries!

15 Dragon Ball

History Of Saiyan Race

Goku Saiyan from Dragon Ball

Dragon Ball

Release Date
February 26, 1986

Seasons
5

Studio
Toei Animation

Dragon Ball’s Unsolved Mystery

  • History of the Saiyan Race
  • Frieza’s motives to destroy Planet Vegeta

In Dragon Ball, the history of the Saiyan race from the planet Vegeta has not been fully explored, leading to several mysteries. Saiyans are known for their fighting prowess and ability to transform into powerful forms, especially under a full moon. The series reveals their home planet was destroyed by Frieza, fearing their potential.

Key Saiyan characters include Goku and Vegeta, whose backgrounds provide insights into Saiyan culture and abilities. The origins of the Super Saiyan legend, a transformation elevating their power exponentially, is a central aspect. However, the deeper historical context, the evolution of their abilities, and the origin of their aggressive nature remain largely unexplored.

Release Date

Episode Count

Status

Where To Watch

February 26, 1986

153

Finished

Crunchyroll

14 Bleach

Soul King’s True Purpose

Soul King from Bleach

Bleach’s Unsolved Mystery

  • True nature shrouded in mystery
  • Is the Soul King alive or sealed is not known

In Bleach, the Soul King has led to many fan debates and remains one of the series’ unsolved mysteries. The Soul King is presented as a pivotal entity in the balance of the Bleach universe, residing in the Soul Society’s Royal Palace. He has ties to the Soul Society, Hueco Mundo, and the Human World.

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It’s hinted that the Soul King is a God-like entity that is sealed or more of a prisoner than a ruler, raising questions about the ethical implications of his existence. The series creator, Tite Kubo, provides limited information, leading to speculation among fans. Characters like Yhwach offer insights, but their perspectives are biased, leaving the Soul King’s true purpose and nature largely a mystery.

Release Date

Episode Count

Status

Where To Watch

October 11, 2022

26

Finished

Hulu

13 One Piece

The Will Of D.

Will of D - One Piece

One Piece

$9 $32 Save $23

Release Date
October 20, 1999

Seasons
20 seasons (ongoing)

Studio
Toei Animation

One Piece’s Unsolved Mystery

  • Possible connection to Void Century
  • Recurring and mysterious stories of the will of D.

In One Piece, the Will of D. is a mysterious and recurring theme, deeply intertwined with the series’ lore, but remains an unsolved mystery. Characters who carry the initial D. in their names, like Monkey D. Luffy, Trafalgar D. Water Law, and Gol D. Roger, share certain traits, such as a strong will and an ability to influence those around them.

The series hints at a significant historical or mythical connection behind this initial, potentially tied to the Void Century, a 100-year period in the world’s history that remains blank in historical records. The exact nature, origin, and full significance of the Will of D. have yet to be fully revealed.

Release Date

Episode Count

Status

Where To Watch

October 20, 1999

1000+

Ongoing

Crunchyroll

12 Naruto

Uzumaki Clan’s Powers

Uzumaki Clan - Naruto

Naruto

$21 $40 Save $19

Release Date
October 3, 2002

Seasons
5

Studio
Pierrot

Naruto’s Unsolved Mystery

  • Uzumaki clan notable for life force, sealing, and chakra
  • Full range of abilities or how the clan got these powers is unclear

In Naruto, the Uzumaki Clan is known for their exceptionally strong life force, sealing jutsu, and chakra, which lead to their village’s destruction. Key members of the Uzumaki clan include Kushina (Naruto’s mother), Nagato (Rinnegan bearer), and Mito (First Hokage’s wife). Naruto inherits this strong life force and chakra, contributing to his extraordinary stamina and healing abilities.

The Uzumaki clan’s prowess in fuinjutsu (sealing techniques) is showcased in various powerful seals, like the Reaper Death Seal and the Eight Trigrams Sealing Style, which played crucial roles in key events, like sealing the Nine-Tails. Despite these examples, the clan’s history, the full range of their abilities, and the deeper implications of their sealing techniques remain largely unexplained.

Release Date

Episode Count

Status

Where To Watch

October 3, 2002

220

Finished

Crunchyroll

11 Attack On Titan

Origin Of Titan Powers

Devil of All Earth from Attack on Titan

Attack On Titan

$35 $60 Save $25

Release Date
September 28, 2013

Seasons
4

Studio
WIT Studio, MAPPA

Attack On Titan’s Unsolved Mystery

  • Powers originate from Ymir Fritz legend
  • Origins of the Titan’s existence are unknown

In Attack on Titan, the origin of the Titan powers remains shrouded in mystery. These powers allow humans to transform into Titans, giant humanoid creatures. The story reveals that these abilities originated from Ymir Fritz, an ancient figure who, according to legend, gained the power of the Titans after a pact with the Devil of All Earth.

However, this origin story is laced with myth and subject to interpretation. Ymir’s power, upon her death, fragmented into the Nine Titans, each with unique abilities, passed down through Eldian bloodlines. Despite these revelations, the series leaves the true, deeper nature of the Titan powers, their exact origin, and fundamental workings largely unexplored.

Release Date

Episode Count

Status

Where To Watch

April 7, 2013

90

Finished

Crunchyroll

10 FLCL

The Atomsk Mystery

Atomsk from FLCL

FLCL

$23 $50 Save $27

Release Date
April 26, 2000

Seasons
1

Studio
Gainax Production I.G

FLCL’s Unsolved Mystery

  • Unsure if the Atomsk entity is real or not
  • Makes a brief appearance as a bird like figure

In FLCL (Fooly Cooly), the Atomsk mystery is a central enigma that drives much of the plot. Atomsk, also known as the Pirate King, is a powerful, enigmatic entity renowned throughout the galaxy for the ability to steal entire star systems. However, his true form and intentions are shrouded in mystery.

The character Haruko Haruhara obsessively pursues Atomsk, believing that capturing him will grant her immense power. Despite his significance in the story, Atomsk’s actual appearance is brief, mainly represented by a symbol or as a giant, red, bird-like creature. The elusive nature of Atomsk and various characters’ interpretations of him contribute to the surreal and symbolic storytelling style of FLCL.

Release Date

Episode Count

Status

Where To Watch

April 26, 2000

6

Finished

Crunchyroll

9 Tokyo Ghoul

Clowns Motives

Clowns from Tokyo Ghoul

Tokyo Ghoul

$22 $50 Save $28

Release Date
July 4, 2014

Seasons
4

Studio
Studio Pierrot

Tokyo Ghoul’s Unsolved Mystery

  • True motives wrapped in mystery
  • Cause destruction and manipulation

In Tokyo Ghoul, the Clowns are a mysterious group whose true motives remain largely obscured. They are known for their chaotic actions and involvement in events that stir up trouble, like the auction incident and the Anteiku raid. The Clowns often act unpredictably, making it difficult to discern their true intentions.

Key members of the Clowns include Uta, Itori, and Nico, each with their own unique characteristics and abilities. The group’s leader is revealed to be Furuta Nimura, who has a complex agenda involving the manipulation of the CCG (Commission of Counter Ghoul). The Clowns seem to be driven by a desire to create chaos and disrupt the status quo, but their deeper motivations are wrapped in ambiguity.

Release Date

Episode Count

Status

Where To Watch

July 4, 2104

12

Finished

Crunchyroll

8 Serial Experiments Lain

Wired’s True Nature

Lain from Serial Experiments Lain

Serial Experiments Lain

Release Date
July 6, 1998

Seasons
1

Distributor
FUNimation

Serial Experiments Lain’s Unsolved Mystery

  • The Wired’s origins unknown
  • Influences perceptions, memories, and psychological states

In Serial Experiments Lain, the Wired is a central concept, functioning as an advanced form of the internet. Its true nature, however, is complex and not understood, blurring the lines between reality and the digital world. The series showcases identity, consciousness, and the nature of reality, with the Wired playing a key role in this exploration.

Lain Iwakura, the protagonist, delves into the Wired and discovers it has tangible effects in the real world, such as altering people’s perceptions and memories. The series suggests that the Wired could be an evolutionary step for humanity. The anime leaves these interpretations open, allowing the Wired to be seen as a metaphor for the internet’s impact on society.

Release Date

Episode Count

Status

Where To Watch

July 6, 1998

13

Finished

Crunchyroll

7 Cowboy Bebop

Spike’s Real Fate

Spike from Cowboy Bebop

Cowboy Bebop

$15 $60 Save $45

Release Date
April 3, 1998

Seasons
1

Studio
Sunrise

Cowboy Bebop’s Unsolved Mystery

  • Final battle results in severe injuries
  • Spike Spiegel’s fate left intentionally ambiguous

In Cowboy Bebop, a popular 90s anime, the fate of Spike Spiegel is a major point of debate among fans. In the final episode, The Real Folk Blues Part II, Spike confronts his arch-rival, Vicious, at the headquarters of the Red Dragon Syndicate. After a fierce fight, Spike emerges victorious but is severely wounded.

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The series concludes with Spike walking down the stairs, injured and exhausted. He encounters members of the Syndicate, performs a finger gun gesture, says Bang, and then collapses. The screen fades to black, leaving his fate uncertain. Is he dead or just unconscious? The show’s creator, Shinichiro Watanabe, has intentionally left the ending ambiguous, stating in interviews that he wants viewers to decide for themselves.

Release Date

Episode Count

Status

Where To Watch

April 3, 1998

26

Finished

Crunchyroll

6 Overlord

Ainz Stuck In The Game

Ainz Ooal Gown from Overlord

Overlord

Release Date
July 7, 2015

Seasons
4

Distributor
AT-X, Ani-One Asia, Crunchyroll

Overlord’s Unsolved Mystery

  • Ainz trapped inside game post-shutdown
  • Cause or how it happened is not explained

In Overlord, the main character, Ainz Ooal Gown, formerly known as Momonga, becomes trapped in a virtual game world. As the servers of the DMMO-RPG (Dive Massively Multiplayer Online Role-Playing Game) Yggdrasil are about to shut down, Momonga, the guild leader of Ainz Ooal Gown, finds himself unable to log out.

Instead, he becomes his in-game character, a powerful skeletal mage, and the game’s NPCs (Non-Player Characters) gain consciousness. The series never fully explains why or how this transition from the real world to the game world occurs. There are no clear indicators of malfunction or external intervention. Ainz’s predicament remains a fundamental mystery, forming the basis of the series’ plot.

Release Date

Episode Count

Status

Where To Watch

July 7, 2015

13

Finished

Crunchyroll

5 Berserk

God Hand’s Agenda

The God Hand from Berserk

Berserk

$50 $70 Save $20

Release Date
July 1, 2016

Seasons
2

Studio
Liden Films

Berserk’s Unsolved Mystery

  • Manipulate events and wars
  • True endgame and motivations unknown

In Berserk, the God Hand is a powerful group of five demon lords, each with immense power. Their agenda, however, is shrouded in mystery and subject to various interpretations. The God Hand members include Void, Slan, Ubik, Conrad, and Femto (Griffith’s reborn form), who orchestrate events from behind the scenes.

Throughout Berserk, the God Hand’s actions suggest a desire to manipulate and control the course of humanity and the fate of individual characters like Guts. Their agenda is tied to causality, where they appear to influence or even dictate the course of events according to some inscrutable, predestined plan. However, the full extent of their origins and the true nature of their endgame remain an unsolved mystery.

Release Date

Episode Count

Status

Where To Watch

July 1, 2016

12

Finished

Crunchyroll

4 Hunter X Hunter

The Dark Continent

The Dark Continent from Hunter x Hunter

Hunter x Hunter

$24 $25 Save $1

Genre
Action, Adventure

Number of Seasons
6

Debut Date
October 2, 2011

Studio
Nippon TV

Hunter X Hunter’s Unsolved Mystery

  • Vast unexplored and dangerous territory
  • Past expeditions faced catastrophic losses

In Hunter x Hunter, the Dark Continent is a vast, unexplored territory outside the known world map, shrouded in mystery and danger. It’s said to be the source of many of the world’s most mysterious and powerful creatures, as well as rare resources. The Dark Continent is extremely hazardous; expeditions there have resulted in catastrophic losses, with a 0.04% survival rate.

The series creator, Yoshihiro Togashi, introduces the Dark Continent through Gon’s father, Ging Freecss, who describes its immense scale and inherent dangers. The significance of the Dark Continent lies in its potential to expand the Hunter x Hunter universe. However, the Dark Continent’s lore, its inhabitants, and what it contains remain largely unexplored.

Release Date

Episode Count

Status

Where To Watch

October 2, 2011

148

Finished

Crunchyroll

3 One Punch Man

Saitama’s Source Of Power

Saitama from One Punch Man

One Punch Man

$23 $50 Save $27

Release Date
October 5, 2015

Genres
Action , Comedy , Superhero

Seasons
2

Studio
Madhouse

One Punch Man’s Unsolved Mystery

  • Saitama’s immense strength
  • Regimen seems inadequate for superhuman abilities

In One Punch Man, Saitama, the protagonist, can defeat any opponent with a single punch. Still, the source of his strength is paradoxically mundane and becomes a running joke. Saitama explains that his strength results from an absurdly simple training regimen of 100 push-ups, 100 sit-ups, 100 squats, and a 10 km run every day for three years, along with no air conditioning or heating to build mental strength.

This explanation is met with disbelief by other characters, as it’s a relatively normal workout routine, not nearly rigorous enough to explain his superhuman abilities. The lack of a conventional explanation for Saitama’s power remains a humorous and intriguing unsolved mystery.

Release Date

Episode Count

Status

Where To Watch

October 5, 2015

12

Finished

Crunchyroll

2 Naruto

Uchiha Itachi’s Illness

Uchiha Itachi and Sasuke from Naruto

Naruto

$21 $40 Save $19

Release Date
October 3, 2002

Seasons
5

Studio
Pierrot

Naruto’s Unsolved Mystery

  • Itachi suffers from a terminal illness
  • Nature of disease remains unexplained

In Naruto, the illness of Uchiha Itachi, a crucial and complex character, remains unexplained. Itachi, a prodigy of the Uchiha clan, suffers from a mysterious and terminal illness that progressively weakens him throughout the series. This illness plays a significant role in shaping his actions and, ultimately, his fate.

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The nature of Itachi’s disease is never fully revealed. However, it’s depicted through various symptoms: coughing fits, often with blood, and a consistent decline in his physical capabilities. Knowing his time is limited, Itachi orchestrates events, including his own death, to set Sasuke on a path he believes will protect him and redeem the Uchiha name.

Release Date

Episode Count

Status

Where To Watch

October 3, 2002

220

Finished

Crunchyroll

1 One Piece

One Piece Treasure

Luffy and Nami from One Piece

One Piece

$9 $32 Save $23

Release Date
October 20, 1999

Seasons
20 seasons (ongoing)

Studio
Toei Animation

One Piece’s Unsolved Mystery

  • Gol D. Roger’s hidden treasure
  • Nature of treasure is vastly speculated

One Piece, the legendary treasure, is #1 on this list because it is the series’ central mystery and the ultimate goal of the protagonist, Monkey D. Luffy, and other pirates. The legendary Pirate King, Gol D. Roger, left the treasure somewhere in the Grand Line.

One Piece is said to be located on an island called Raftel, and the journey to find the treasure is dangerous. Despite numerous theories and hints, the exact nature of One Piece is deliberately kept vague. It’s suggested to be something of immense value, but whether it’s a tangible treasure, a historical secret, a powerful weapon, or something entirely different remains unknown.

Release Date

Episode Count

Status

Where To Watch

October 20, 1999

1000+

Ongoing

Crunchyroll

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