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HomeSeinen 10 Best Anime to Watch: Complete 21st-Century.

10 Best Anime to Watch: Complete 21st-Century.

gautamsingh212002@gmail.com on March 26, 2026
Seinen
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12 Min Read

Starting a new anime can be exciting—until you realize the story isn’t actually finished. You spend dozens of episodes getting attached to the characters, learning the world, and following every mystery, only to reach the latest episode and discover that the story is still waiting for another season. Sometimes that season takes years to arrive. Sometimes it never does.

That’s why it’s so satisfying to find an anime that has already reached its conclusion. You can start the journey knowing you’ll eventually see how everything plays out.

Fortunately, the 21st century has produced plenty of anime that tell complete stories without leaving viewers waiting for the next chapter. Some are action-heavy adventures, others are psychological thrillers or character-driven dramas, but they all share one thing: their main stories have reached a proper ending. So, if you’re looking for a finished anime to binge without worrying about an unfinished story, here are 10 series worth putting on your watchlist.

Contents

  • 1. 1. Fullmetal Alchemist: Brotherhood
  • 2. 2. Attack on Titan
  • 3. 3. Samurai Champloo
  • 4. 4. Ping Pong the Animation
  • 5. 5. Durarara
  • 6. 6. Monster
  • 7. 7. Gurren Lagann
  • 8. 8. Steins;Gate
  • 9. 9. Mob Psycho 100
  • 10. 10. Gintama
  • 11. Final Thoughts
    • 11.1. What is the best complete anime of the 21st century?
    • 11.2. Which anime on this list is the shortest?
    • 11.3. Which completed anime is best for beginners?
    • 11.4. Is Attack on Titan completely finished?
    • 11.5. Which anime has the best character development?

1. Fullmetal Alchemist: Brotherhood

A Nearly Perfect Balance of Action, Emotion and Storytelling. If someone asks me to name a shonen anime that tells a complete story, Fullmetal Alchemist: Brotherhood is one of the first titles that comes to mind.

The story follows brothers Edward and Alphonse Elric, who pay a terrible price after attempting to bring their deceased mother back using alchemy. Edward loses limbs while Alphonse loses his entire body, leaving the brothers searching for a way to restore what they lost.

What makes Brotherhood special isn’t simply its action. The series manages to combine adventure, comedy, political intrigue, emotional drama, mythology and philosophical questions without making the story feel unnecessarily stretched. And at 64 episodes, it manages to accomplish an impressive amount.

The characters actually develop, mysteries eventually receive answers, and major storylines are given proper conclusions. Most importantly, the ending feels like the natural result of everything the brothers have experienced.

My take: If you want a finished anime that introduces someone to the best qualities of shonen storytelling, Fullmetal Alchemist: Brotherhood is an incredibly safe recommendation.

Episodes: 64
Genre: Action, Adventure, Fantasy, Drama

2. Attack on Titan

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Ten Years of Mystery, War and Consequences

Few anime have generated as much discussion as Attack on Titan. What begins as a seemingly straightforward survival story about humanity fighting gigantic, man-eating Titans gradually becomes something far more complicated. Political conflict, history, ideology, revenge, and the consequences of war eventually become just as important as the Titans themselves.

Eren Yeager’s journey sits at the center of this transformation, and watching his character evolve over the course of the series is one of the most fascinating parts of the experience.

The anime originally premiered in 2013 and finally reached its conclusion in 2023, giving fans roughly a decade of anticipation, theories, and debates. Not every decision in the finale was universally accepted, and the ending remains a divisive topic among fans. Still, the completed series as a whole delivers an enormous narrative experience filled with memorable characters, major twists and some genuinely unforgettable moments.

My take: Even if you have heard the ending spoilers, Attack on Titan is still worth experiencing for yourself. The journey and the revelations along the way are a huge part of what makes it special.Genre: Dark Fantasy, Action, Drama, Mystery

3. Samurai Champloo

A Short Journey That Leaves a Long Impression. Samurai Champloo is proof that an anime doesn’t need hundreds of episodes to create memorable characters.

Created by Shinichiro Watanabe, the same director behind Cowboy Bebop, the series follows three unlikely companions: Fuu, Mugen and Jin. Their journey begins when Fuu recruits the two wandering swordsmen to help her search for a mysterious samurai “who smells of sunflowers.”

From there, the trio travels across Japan, encountering strange characters, dangerous enemies and plenty of trouble along the way. What makes Samurai Champloo stand out is its unusual combination of traditional samurai aesthetics with hip-hop culture. The soundtrack, sword fights, animation and storytelling all come together to create an identity that is almost impossible to confuse with anything else.

The series has only 26 episodes, and honestly, that works in its favor. It tells what it needs to tell without overstaying its welcome.

My take: If you’re looking for something stylish, atmospheric and relatively quick to finish, this is one of those anime I’d recommend without hesitation.

Episodes: 26
Genre: Action, Samurai, Adventure

4. Ping Pong the Animation

Don’t Let the Simple Premise Fool Yo. At first glance, an anime about competitive table tennis might not sound like something extraordinary. Instead of focusing purely on tournaments and increasingly powerful techniques, the series uses table tennis as a way to explore ambition, friendship, talent, failure and the pressure of finding a purpose.

The sight is also very different from the smooth look which many viewers link with modern anime; although its rough and expressive artwork may at first be somewhat uncomfortable to habituate to, it matches the emotional intensity of the story exactly.

At only 11 episodes, it wastes almost no time. Characters change, relationships evolve and the story constantly moves forward And that’s probably one of its biggest strengths.

My take: Give it two or three episodes before deciding whether the art style works for you. Beneath that unconventional presentation is a surprisingly powerful character drama.

Episodes: 11
Genre: Sports, Drama, Psychological

5. Durarara

A Chaotic City Where Everyone Has a Story

The anime brings together ordinary students, gang members, information brokers, supernatural beings and urban legends, creating a huge web of characters whose stories eventually collide. One of the most interesting things about the show is how it uses different points of view. Rather than sticking with one main character, the story often jumps between different people.

That can make the early episodes feel confusing. But once you start understanding how everyone is connected, those different perspectives become one of the show’s biggest strengths. The original Durarara!! story provides a substantial conclusion across its run, although the franchise later continued with Durarara!!×2, which expands the story considerably.

My take: This is the kind of anime that becomes more enjoyable as you understand its character web. Don’t worry if everything doesn’t make sense immediately.

Episodes: 24 + 36 (Durarara!!×2)
Genre: Urban Fantasy, Mystery, Supernatural

6. Monster

One of Anime’s Most Patient Psychological Thrillers, If you’re willing to take your time with a story, Monster deserves your attention.

The anime follows Dr. Kenzo Tenma, a talented Japanese surgeon working in Germany. One decision early in his career changes his life forever when he chooses to save the life of a young boy named Johan Liebert. Years later, Tenma discovers that Johan has become a terrifying killer.

What follows is a slow-burning psychological thriller built around questions of morality, identity, human nature and the value of life. While a great many modern thrillers continually present action sequences to their audience, Monster gradually creates a sense of suspense through the course of conversations, investigations and the ever-more disturbing discoveries.

Its 74 episodes may look intimidating, but the length gives the story room to develop its characters and atmosphere.

My take: This is definitely not a “watch while scrolling through your phone” anime. Give it your attention, and the payoff becomes much stronger.

Episodes: 74
Genre: Psychological, Thriller, Mystery, Drama

7. Gurren Lagann

An Anime That Treats “Too Much” as a Superpowe, If subtle storytelling isn’t what you’re looking for, Gurren Lagann might be the complete opposite.

This 27-episode mecha series starts relatively small but keeps escalating until the scale becomes completely ridiculous—in the best possible way.

Simon is a shy young man who lives down below with his friend Kamina; their lives change when they come across a powerful mecha, which causes them to enter an adventure that begins as a struggle to survive and eventually becomes something far more significant. The series is loud, energetic and unapologetically dramatic. But underneath all the explosions and giant robots is a surprisingly meaningful message about perseverance, ambition and refusing to accept limitations.

The story keeps raising the stakes without losing its emotional core.

My take: Gurren Lagann is the kind of anime you watch when you want pure adrenaline with an emotional payoff. Don’t overthink the absurdity—embrace it.

Episodes: 27
Genre: Mecha, Action, Adventure, Sci-Fi

8. Steins;Gate

A Time-Travel Story That Makes Its Characters Matter

The story follows Rintaro Okabe, an eccentric self-proclaimed mad scientist who discovers that his experiments may have much greater consequences than he initially realizes.

The beginning is relatively slow compared with the intense second half. The anime spends considerable time introducing Okabe, Kurisu and the rest of the cast before gradually revealing the darker implications of their experiments. Once the story shifts gears, however, it becomes extremely difficult to stop watching.

The emotional consequences of changing the past become just as important as the science-fiction elements, making the characters’ struggles feel personal rather than simply serving as plot devices. The original Steins;Gate tells a complete story in 24 episodes. Steins;Gate 0 later explores another timeline and provides a different perspective on the overall narrative.

My take: Be patient with the first few episodes. The slower setup makes the later payoff hit much harder.

Episodes: 24
Genre: Sci-Fi, Thriller, Drama, Time Travel

9. Mob Psycho 100

The Real Superpower Is Becoming a Better Person

On paper, Mob Psycho 100 looks like another anime about an incredibly powerful protagonist. Shigeo “Mob” Kageyama possesses extraordinary psychic abilities, but being powerful isn’t what he wants his life to be about.

Instead, Mob struggles with ordinary teenage problems—friendships, emotions, confidence, relationships, and figuring out who he wants to become.

That’s what makes the series so refreshing. The spectacular animation and psychic battles are certainly entertaining, but the emotional development is where Mob Psycho 100 truly shines. Across its three seasons, Mob gradually learns that becoming stronger isn’t simply about increasing his supernatural abilities.

The series eventually gives his character arc a proper conclusion, making the final season feel like the culmination of everything that came before it.

My take: Don’t go into Mob Psycho 100 expecting just another overpowered protagonist story. Its emotional side is arguably more important than its action.

Seasons: 3
Genre: Action, Supernatural, Comedy, Drama

10. Gintama

Hundreds of Episodes, Countless Jokes and a Surprisingly Emotional Goodbye

It contains an enormous amount of absurd humor, parody and ridiculous situations. But over its long run, Gintama also develops surprisingly serious stories involving friendship, loss, loyalty and sacrifice.

The series follows Gintoki Sakata, a former samurai living in an alternate version of Edo-era Japan where aliens have taken over much of society. Alongside Shinpachi and Kagura, Gintoki takes on odd jobs but keeps getting caught up in much bigger conflicts.

What makes Gintama unusual is the way it can jump from completely ridiculous comedy to genuinely emotional drama without completely losing its identity.

After more than 360 episodes, the franchise eventually reached its major conclusion with Gintama: The Very Final in 2021. That’s an enormous commitment—but for viewers who become attached to the cast, saying goodbye can feel surprisingly emotional.

My take: Don’t judge Gintama after only a few episodes. It takes time to understand its humor and characters. Once it clicks, though, the long journey becomes part of the experience.Episodes: 367+
Genre: Comedy, Action, Sci-Fi, Samurai, Drama

Final Thoughts

One of the biggest advantages of watching a completed anime is knowing that you can experience the entire story on your own terms.

You don’t have to wait years for another season. You don’t have to wonder whether a cliffhanger will ever be resolved. And you can binge the story from its opening episode all the way to its final chapter.

The anime on this list offer very different experiences. Fullmetal Alchemist: Brotherhood delivers a carefully constructed shonen adventure, Monster takes its time with psychological storytelling, Samurai Champloo focuses on the journey, while Gurren Lagann goes completely over the top.

And that’s really the fun part.

There isn’t one formula for a satisfying completed anime. Sometimes it’s about the ending itself. Other times, it’s about how much the characters change before they reach it. If you’ve been avoiding unfinished anime and want something you can start knowing the story actually has an ending, these ten are a great place to begin.

What is the best complete anime of the 21st century?

Fullmetal Alchemist: Brotherhood is one of the most popular choices for viewers looking for a complete anime with a well-developed story, memorable characters, strong worldbuilding and a satisfying conclusion. However, the best choice depends on the type of story you enjoy.

Which anime on this list is the shortest?

Ping Pong the Animation is the shortest anime featured here, with just 11 episodes. Despite its short runtime, it delivers a surprisingly deep story focused on competition, ambition, friendship and personal growth.

Which completed anime is best for beginners?

Fullmetal Alchemist: Brotherhood is a strong starting point for beginners because it combines action, adventure, comedy, drama and fantasy while maintaining a relatively straightforward story.

Is Attack on Titan completely finished?

Yes. The main Attack on Titan anime concluded in 2023 after running for roughly a decade. The complete story can now be watched without waiting for another main season.

Which anime has the best character development?

Several anime on this list place a major emphasis on character development. Mob Psycho 100 is particularly focused on personal growth, while Fullmetal Alchemist: Brotherhood and Attack on Titan develop large casts over much longer stories.

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gautamsingh212002@gmail.com on March 26, 2026 Seinen
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