How long does it take to watch all of Oniichan wa Oshimai!?

About 4.6 hours for all 12 episodes at 23 min each — a weekend; at two episodes a night that is 6 evenings.

Is Oniichan wa Oshimai! finished?

Yes, Oniichan wa Oshimai! is finished (12 episodes), so you can watch the whole thing at your own pace.

Is Oniichan wa Oshimai! good for a group?

Yes. Oniichan wa Oshimai! is tagged comedy, the tags that survive a room full of people talking over the screen.

Where is Oniichan wa Oshimai! listed?

Oniichan wa Oshimai! is on AniList (id 147864) and MyAnimeList (id 51678); Queue Up keys it by its AniList id and shows it when it is on either of your lists.

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Anime lists › Best yuri anime to watch with a friend

Is Oniichan wa Oshimai! good to watch with a friend?

Easy to drop in. Oniichan wa Oshimai! (ONIMAI: I'm Now Your Sister!) is a TV series from Winter 2023 by Studio Bind, Studiobind Co., Ltd.: 12 episodes, about 4.6 hours in total, finished, 7.64/10 across the listing sites.

manga adaptationcute girls doing cute thingscomedycoming of agecookingslice of lifeecchifound family

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 4.6 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: 23 min
Total time: about 4.6 hours — a weekend
First aired: Winter 2023
Status: Finished
Studio: Studio Bind, Studiobind Co., Ltd.
Score: 7.64/10 across the listing sites
Tags: manga adaptation, cute girls doing cute things, comedy, coming of age, cooking, slice of life, ecchi, found family, nudity, school, sci-fi, shounen, yuri

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 Oniichan wa Oshimai!?

Queue Up reads two public AniList lists and shows every anime you both have on Planning — with Oniichan wa Oshimai! 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: manga adaptation · cute girls doing cute things · comedy · coming of age · cooking · slice of life · found family · school · sci-fi · shounen · yuri.

Quick answers

How long does it take to watch all of Oniichan wa Oshimai!?: About 4.6 hours for all 12 episodes at 23 min each — a weekend; at two episodes a night that is 6 evenings.
How many episodes does Oniichan wa Oshimai! have?: 12 episodes of 23 min.
Is Oniichan wa Oshimai! finished?: Yes, Oniichan wa Oshimai! is finished (12 episodes), so you can watch the whole thing at your own pace.
Is Oniichan wa Oshimai! good for a group?: Yes. Oniichan wa Oshimai! is tagged comedy, the tags that survive a room full of people talking over the screen.
Where is Oniichan wa Oshimai! listed?: Oniichan wa Oshimai! is on AniList (id 147864) and MyAnimeList (id 51678); 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