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Is the Anime Finished?
Is the Anime Finished?
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Is This Boy Can Fight Aliens! Finished? Watch Order & Everything You Need to Know

Yaoi Sci-Fi Boys-Love Finished Short Anime
Table of Contents

Overview: What is “This Boy Can Fight Aliens!”?
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If you are looking for a blend of sci-fi action and emotional drama, This Boy Can Fight Aliens! (also known as Kono Danshi, Uchū-jin to Tatakaemasu.) offers a unique premise. The story takes place during an alien invasion where Earth is fighting a losing battle. The tide begins to turn when Arikawa, a member of the defense command staff, discovers a teenager named Kakashi.

While Kakashi possesses the impossible power to defeat the alien attackers, there is a catch: he has lost his memory and doesn’t know how to use his abilities. To manage this, Arikawa moves Kakashi in with himself and his own commander, Shiro. This living arrangement sparks a complex triangle of emotions and relationships that not only challenges the characters’ motivations but also threatens the very fate of the planet.

If you’re ready to dive into this interstellar romance, you can watch the anime on Prime Video.

Who is this anime for?
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This series is primarily suited for fans of the yaoi (Boys’ Love) genre. It combines the high stakes of a global alien invasion with the intimate tension of a romantic triangle. The appeal lies in the balance between the mystery of Kakashi’s lost memories and the evolving relationships between the three lead men.

For those who enjoy collecting items from their favorite BL series, you can buy official merchandise here.

Is the anime really finished?
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When deciding whether to commit to this series, it is important to understand its place within its wider franchise. This Boy Can Fight Aliens! is part of a collection of “This Boy” themed projects. While the individual story focuses on the conflict between Earth and the aliens, viewers often find that the experience is enhanced by exploring the related “This Boy” titles to get a full sense of the brand’s storytelling style.

If you find yourself wanting more depth or a more comprehensive conclusion than what is provided in the animation, we highly recommend checking out the written materials. You can buy the manga or light novel to fill in any gaps.

Recommended Watch Order#

Because this series is part of a broader set of related works, the order in which you watch them can change your experience. You can refer to the relationship tree below the article for a visual guide, but here are our recommendations:

Release Order
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For those who want to experience the series as they were originally debuted, follow the release dates:

  1. This Boy Can Fight Aliens! (2011)
  2. This Boy Caught a Merman (2012)
  3. This Boy Suffers from Crystallization (2014)
  4. This Boy is a Professional Wizard (2016)

Completionist Order
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For the completionist who wants every single “This Boy” experience, the release order is the best path. This allows you to see the evolution of the series and its related themes over time.

For Source Material Readers
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If you do not mind continuing with the source material, we suggest watching This Boy Can Fight Aliens! first to establish the tone, then alternating between the related anime and their respective manga/light novels for a deeper dive into the characters’ emotional arcs.

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This Boy Can Fight Aliens! • anime • 2011-10-10
  └─(related)→  This Boy Caught a Merman • anime • 2012-11-09
  └─(related)→  This Boy Suffers from Crystallization • anime • 2014-12-03
  └─(related)→  This Boy is a Professional Wizard • anime • 2016-02-05 to 2016-02-26

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