Is Onihei good to watch with a friend?
A quiet night. Onihei is a TV series from Winter 2017 by Mappa, Studio M2: 13 episodes, about 5 hours in total, finished, 7.27/10 across the listing sites.
Watching it together: a quiet night. Tagged tragedy and not comedy: this wants attention and the right mood, not background chatter. Rule: heavy drama or psychological tags without comedy → quiet night.
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
- 13
- Episode length
- 23 min
- Total time
- about 5 hours — a weekend
- First aired
- Winter 2017
- Status
- Finished
- Studio
- Mappa, Studio M2
- Score
- 7.27/10 across the listing sites
- Tags
- action, coming of age, crime, slice of life, detective, drama, episodic, friendship, gore, historical, revenge, samurai, seinen, swordplay, tragedy, violence, workplace
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.
Do you and a friend both want to watch Onihei?
Queue Up reads two public AniList lists and shows every anime you both have on Planning — with Onihei 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 · coming of age · crime · slice of life · detective · drama · friendship · historical · revenge · samurai · seinen · swordplay · tragedy · workplace.
Quick answers
- How long does it take to watch all of Onihei?
- About 5 hours for all 13 episodes at 23 min each — a weekend; at two episodes a night that is 7 evenings.
- How many episodes does Onihei have?
- 13 episodes of 23 min.
- Is Onihei finished?
- Yes, Onihei is finished (13 episodes), so you can watch the whole thing at your own pace.
- Is Onihei good for a group?
- Yes. Onihei is tagged action, the tags that survive a room full of people talking over the screen.
- Where is Onihei listed?
- Onihei is on AniList (id 97590) and MyAnimeList (id 33983); 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