Tantei wa Mou, Shindeiru.

Kimihiko Kimizuka has found himself inadvertently entangled in various crimes more times than he can remember, referring to himself as a magnet for trouble. One day, as if it was nothing out of the ordinary, a group of unknown men kidnaps him, forcing him to board a flight—where he also encounters a hijacking. Amid the resulting chaos, however, Kimizuka meets a stunning silver-haired beauty, going by the codename Siesta, who then saves the day.

Claiming to be a legendary detective, Siesta enlists Kimizuka to be her sidekick. Though Kimizuka refuses at first, with Siesta's insistence, he eventually joins her—marking the start of a grand adventure spanning the entire world, preventing multiple threats that could spell doom for humanity along the way.

Unfortunately, after three years of their unpredictable yet enjoyable time together, Siesta abruptly passes away. Distraught, Kimizuka tries to leave all memories of her behind, but as he begins to meet more people, it seems that Siesta's influence will never truly die.

[Written by MAL Rewrite]

Siesta Main

Miyashita, Saki Japanese

Natsunagi, Nagisa Main

Taketatsu, Ayana Japanese

Kimizuka, Kimihiko Main

Nagai, Arata Japanese

Saikawa, Yui Supporting

Takao, Kanon Japanese

Arisaka Anderson, Charlotte Supporting

Shirasu, Saho Japanese

Kase, Fuubi Supporting

Fuchigami, Mai Japanese

Koumori Supporting

Matsuoka, Yoshitsugu Japanese

Hel Supporting

Hanamori, Yumiri Japanese

Alicia Supporting

Naganawa, Maria Japanese

Chameleon Supporting

Koyasu, Takehito Japanese

Tokumura, Kenichi Producer

Maruyama, Hajime Producer

Isogai, Noritomo Producer

Arimizu, Soujirou Producer

Reviews

Dec 30, 2025

eegoist

Recommended

This anime honestly broke me. While the story isn’t completely unique and can be predictable at times, it still works because of its strong emotional core and mystery setup. If you enjoy this genre, the experience is worth it despite its flaws.
The relationship between Kimizuka and Siesta is beautiful and tragic, and it’s the main reason the anime hits so hard emotionally. I can’t fully explain why it affected me this much—it just did. Some moments stay with you long after watching (and the bed episode says enough on its own).
The art style fits the story perfectly. The animation, effects, and especially the coloring are ... stunning—easily some of the best I’ve seen, and they enhance both the emotional and action scenes.
The characters feel mostly well-rounded, with clear strengths and weaknesses, and their reactions to events feel realistic. Even if it’s not for everyone, fans of emotional mystery and romance will likely enjoy it, while others may not connect with it as deeply.
I can’t wait for season 2.
"The Detective might be dead, but her will isn't"

Reviewer’s Rating: 10

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May 22, 2022

AtomicTopHat

Mixed Feelings

The worst part of this anime is that it could have been good. Besides the first episode, the show feels like random clips from the second or even third season of a show. Plot threads are shown in flashbacks but instead of resolving them, they just create more plot threads that they don't do anything with. I never read the source material for Tantei wa Mou, Shindeiru... but I can't imagine how this was all supposed to work.

The anime withholds 90% of the story from you and assures you that stuff was super cool. And then the plot twist only makes sense if the ... MC is a moron, but he is shown to be intelligent even if not as smart as the improbably Sherlockian titular character.

This could have been a fun show if they had presented things in a better way than completely at random.

Reviewer’s Rating: 5

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May 13, 2025

colelouch

Not Recommended

I honestly wish there were an option for a negative score, because this series more than earns it with its pretentious tone, subpar animation, weak plot, and overall waste of time. The fact that some fans defend it by saying “just read the light novel” doesn’t help its case. If you’re looking for sharp dialogue and meaningful romantic chemistry between leads, you’d be far better off watching Monogatari or Bunny Girl Senpai—series that clearly inspired this one, but do it infinitely better.

The show's shift from a supposed detective narrative to generic action feels less like a creative direction and more like a result of the ... author lacking the skills to write an engaging mystery. If that’s the type of transition you enjoy, even Summertime Rendering, which itself has flaws but pulls it off more convincingly. And if you're after something with equally lackluster writing but at least better visuals, go for Takt Op. Destiny; its animation is at least clean and polished compared to this.

Much of the hype around this series seems to center on its so-called "legendary" Episode 1, which to me was just... okay at best. The praise it receives feels like a result of people setting their standards way too low for generic isekai tropes. The rest of the show goes off the rails, filled with contrived plot twists, nonsensical developments, and no clear direction. Some blame the poor pacing and adaptation of the light novels, but I’d argue there was never any proper rhythm or structure to begin with. It reeks of a rushed production, likely due to tight deadlines and heavy outsourcing from Kadokawa and studio ENGI.

The concept of a “successor” could’ve been interesting, but it feels like a rough draft idea stretched into an entire arc, and she immediately falls for the painfully bland protagonist. Speaking of the main character, his submissive personality, uninspired salaryman design, and smug self-righteousness are incredibly off-putting. Rather than coming off as intelligent, he just seems cowardly. Even the voice acting, while clearly earnest, lacks experience and ends up feeling flat and mediocre.

The supporting characters are no better, crammed with tired anime clichés like a loli idol with an eyepatch, another loli, a generic airhead girl, and vtuber, sentai and godzilla references. It all feels like the author threw together whatever personal fetishes he had and called it a multi-genre story. The so-called “detective” elements are all poorly explained, often feeling like the writers pulled random answers out of thin air. Siesta herself acts overly smug, only because the script conveniently hands her the solutions.

The animation and storytelling quality steadily decline, and by the end, both heroes and villains act with such shallow logic it’s almost insulting. The show is filled with dialogue dumps that lead nowhere, and when it finally tries to deliver action, you almost wish it had stuck with talking, because the fight scenes are a mess. The central relationship between the protagonist and Siesta is lifeless and forced, especially compared to how Monogatari or Bunny Girl Senpai handle emotional and philosophical exchanges. Here, the interactions are flat, awkward, and lack any real chemistry.

In the end, I only started watching out of curiosity, but what I got in return was frustration and disappointment, feelings I haven’t had from anime in quite a while. I truly don’t understand what Japanese audiences see in this show; it’s worse than your average isekai, and it’s now firmly in my personal list of top 10 worst anime of all time.

Reviewer’s Rating: 1

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	Poll: Tantei wa Mou, Shindeiru. Episode 12 Discussion ( 1 2 3 ) Stark700 - Sep 19, 2021	128 replies	by ethangoon17 »» Today, 6:13 AM
	Poll: Tantei wa Mou, Shindeiru. Episode 2 Discussion ( 1 2 3 4 5 ) Stark700 - Jul 11, 2021	244 replies	by LyanHS »» Jan 13, 2:14 PM
	Poll: Tantei wa Mou, Shindeiru. Episode 1 Discussion ( 1 2 3 4 5 ... Last Page ) AnonymousGuy9 - Jul 4, 2021	277 replies	by LyanHS »» Jan 12, 7:07 PM
	Poll: Siesta is the plot, no cap (poll) Onii-chanShuki - Sep 19, 2021	14 replies	by 25robF »» Dec 16, 2025 8:30 AM
	Poll: Tantei wa Mou, Shindeiru. Episode 11 Discussion ( 1 2 ) Stark700 - Sep 12, 2021	86 replies	by Chamaco53 »» Oct 23, 2025 5:29 PM