Mohsin Lag 
The best joke in Kill Blue is the setup itself: a legendary 40-year-old hitman gets de-aged into a middle-school body and has to survive his own profession — and puberty — at the same time. Underneath the comedy is the trope the show actually runs on: a killer forced to live a completely ordinary life while hiding who he really is. That tension between the double life and the normal life is one of anime’s best engines, and the shows below all run on it — some for comedy, some for drama, a few for both at once.
The Double Life, Done Right
- The cover story has to hold — the best shows make the ordinary life just as interesting as the secret one.
- The past catches up — you can’t just stop being a killer; the work finds you.
- Identity is the actual plot — who they are under the mask is the question the show cares about.
The 10 Best Undercover Anime, Ranked
1. Sakamoto Days
The obvious first pick for a reason: the greatest hitman alive retires to run a convenience store, gets soft around the middle, and then has to defend the quiet life with a body that forgot nothing. The fight choreography is the best action comedy on TV right now, and the anime adaptation finally delivers it.
2. Spy x Family
A spy, an assassin and a telepath all pretend to be a normal family, each unaware of the others’ secrets. It’s the double-life premise played for warmth, and it works because the fake family slowly becomes the real one — without anyone’s cover actually breaking.
3. The Fable
A legendary hitman is ordered to live a year without killing — no weapons, no bodies, just a normal job and a parrot. The anime adaptation lands in 2026 and the manga is already a masterpiece of deadpan comedy. The tension of an apex predator trying to be boring never stops being funny.
4. Lycoris Recoil
High-school girls who are also government assassins, serving coffee by day and taking hits by night. Bright, fast, and sharper than the premise sounds — the partnership between the two leads is the reason it took off.
5. Assassination Classroom
A classroom of misfits has to kill their own teacher — a smiley tentacle monster who also happens to be the best teacher they’ve ever had. The double life here is the class’s secret mission hiding inside an ordinary school year, and the ending is the genre’s most earned gut-punch.
6. Buddy Daddies
Two hitmen end up co-parenting a four-year-old between jobs. Same studio energy as Spy x Family, but messier and more adult — the question isn’t whether they can keep the kid safe, it’s whether they can keep her from becoming them.
7. Reborn! (Katekyo Hitman Reborn!)
The OG of this exact joke: a normal loser schoolboy is informed by a baby hitman that he’s the heir to a mafia family. The secret organization invades his ordinary life instead of the other way around, and the show runs that gag until it becomes genuinely great action shonen.
8. Phantom: Requiem for the Phantom
The serious version of the trope. A tourist gets kidnapped and brainwashed into becoming an assassin, and the show is a slow, melancholy study of whether the person under the mask survives. Written by Gen Urobuchi before Psycho-Pass — you’ve been warned.
9. Golgo 13
The anti-Kill Blue: a professional with no ordinary life at all, and no interest in one. Every episode is a different job, a different cover, a different country — and the show’s refusal to humanize him is the point. The longest-running assassin in anime history.
10. Hinamatsuri
The comedy pick. A yakuza foot soldier ends up raising a psychic girl who appeared in his apartment, while trying to keep his gang life from ruining hers. The double life here is played for pure chaos, and it’s one of the funniest anime of the last decade.
Frequently Asked Questions
What anime is most similar to Kill Blue?
Sakamoto Days is the closest match — retired hitman, ordinary job, the past refusing to stay buried. For the school-life twist specifically, Assassination Classroom and Reborn! are the ancestors.
Is Kill Blue getting an anime?
The manga has been a Jump hit since 2023 and an adaptation is heavily expected, but nothing is officially confirmed yet — read the manga if you want to stay ahead of the announcement.
Which of these are finished stories?
Assassination Classroom, Phantom, and Hinamatsuri tell complete stories. Sakamoto Days, Spy x Family and The Fable are ongoing — in both manga and anime form.
Why trust this guide: every pick was hand-checked by Mohsin Lag, who has been covering anime for over 20 years. Updated August 2026.
For a personalized top 10 instead of a list, try our free AI anime finder — or check the upcoming anime of 2026 for what’s next.
