How long does it take to watch all of Tantei wa Mou, Shindeiru.?

About 5 hours for all 12 episodes at 25 min each — a weekend; at two episodes a night that is 6 evenings.

Is Tantei wa Mou, Shindeiru. finished?

Yes, Tantei wa Mou, Shindeiru. is finished (12 episodes), so you can watch the whole thing at your own pace.

Is Tantei wa Mou, Shindeiru. good for a group?

Yes. Tantei wa Mou, Shindeiru. is tagged action, comedy, the tags that survive a room full of people talking over the screen.

Where is Tantei wa Mou, Shindeiru. listed?

Tantei wa Mou, Shindeiru. is on AniList (id 128712) and MyAnimeList (id 46471); Queue Up keys it by its AniList id and shows it when it is on either of your lists.

Queue Up — what anime do we watch?Compare two AniList lists →

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Is Tantei wa Mou, Shindeiru. good to watch with a friend?

Easy to drop in. Tantei wa Mou, Shindeiru. (The Detective Is Already Dead: The Lost Memory) is a TV series from Summer 2021 by Engi Co.Ltd.: 12 episodes, about 5 hours in total, finished, 6.5/10 across the listing sites.

actionaliensrobots & AIlight-novel adaptationcomedycrimedetectivedrama

Watching it together: easy to drop in. Slice-of-life: you can start tonight without a plan, and a missed episode does not ruin it. about 5 hours for the run, 6 evenings at two a night. Rule: episodic, slice-of-life, or comedy/action ≤ 26 episodes → easy to drop in.

This verdict comes from rules over the title's format, length and tags, not from a review — the rule that fired is named above.

The facts

Type: TV series
Episodes: 12
Episode length: 25 min
Total time: about 5 hours — a weekend
First aired: Summer 2021
Status: Finished
Studio: Engi Co.Ltd.
Score: 6.5/10 across the listing sites
Tags: action, aliens, robots & AI, light-novel adaptation, comedy, crime, detective, drama, harem, idol, love triangle, monsters, mystery, romance, school, seinen, slice of life, superpowers, mecha, supernatural, tragedy, urban fantasy, violence

Data from anime-offline-database (ODbL) as of 2026-07-04; the score is the median of the scores the anime listing sites give it, on a 1–10 scale. Also listed as: The Detective Is Already Dead; The Detective Is Already Dead..

Do you and a friend both want to watch Tantei wa Mou, Shindeiru.?

Queue Up reads two public AniList lists and shows every anime you both have on Planning — with Tantei wa Mou, Shindeiru. flagged if it is one of them — then picks tonight's with a weighted roll or a bracket.

Or open it on AniList or MyAnimeList.

More like this: action · aliens · robots & AI · light-novel adaptation · comedy · crime · detective · drama · harem · idol · love triangle · monsters · mystery · romance · school · seinen · slice of life · superpowers · mecha · supernatural · tragedy · urban fantasy.

Quick answers

How long does it take to watch all of Tantei wa Mou, Shindeiru.?: About 5 hours for all 12 episodes at 25 min each — a weekend; at two episodes a night that is 6 evenings.
How many episodes does Tantei wa Mou, Shindeiru. have?: 12 episodes of 25 min.
Is Tantei wa Mou, Shindeiru. finished?: Yes, Tantei wa Mou, Shindeiru. is finished (12 episodes), so you can watch the whole thing at your own pace.
Is Tantei wa Mou, Shindeiru. good for a group?: Yes. Tantei wa Mou, Shindeiru. is tagged action, comedy, the tags that survive a room full of people talking over the screen.
Where is Tantei wa Mou, Shindeiru. listed?: Tantei wa Mou, Shindeiru. is on AniList (id 128712) and MyAnimeList (id 46471); Queue Up keys it by its AniList id and shows it when it is on either of your lists.

Queue Up is a free tool: enter two AniList usernames and it ranks the anime you both want to watch, rolls one for tonight, runs a bracket to settle it and finds new anime that fit both of you. List data from AniList; title data: anime-offline-database (ODbL), dataset of 2026-07-04; page updated 2026-07-04. Not affiliated with AniList or MyAnimeList. Queue Up is a Somebody Decide program. How it works · Legal & privacy · All lists