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Kono Naka ni Hitori, Imouto ga Iru!

Alternative Titles

English: NAKAIMO - My Little Sister Is Among Them!
Synonyms: NakaImo, One of Them is My Younger Sister!, Who is Imouto?
Japanese: この中に1人、妹がいる!


Type: TV
Episodes: 12
Status: Finished Airing
Aired: Jul 6, 2012 to Sep 28, 2012
Premiered: Summer 2012
Broadcast: Unknown
Producers: Lantis, TBS, DAX Production
Licensors: Sentai Filmworks
Studios: Studio Gokumi
Source: Light novel
Duration: 24 min. per ep.
Rating: R+ - Mild Nudity


Score: 6.741 (scored by 68,970 users)
1 indicates a weighted score. Please note that 'Not yet aired' titles are excluded.
Ranked: #48542
2 based on the top anime page. Please note that 'Not yet aired' and 'R18+' titles are excluded.
Popularity: #737
Members: 141,547
Favorites: 206
Ranked #4854Popularity #737Members 141,547
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Episodes: /12
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Is insanity hereditary? Shougo Mikadono's beginning to think so, because the terms of his late father's will seem crazy and following them may drive Shougo bonkers as well. Oh, it sounds simple at first: before Shougo can claim his VERY large inheritance, he just has to start attending a certain new school and find a nice girl to marry. It's a little unromantic, but perfectly do-able, right? After all, all the girls seem quite friendly, so all Shougo has to do is find one he has something in common with. EXCEPT, and here's the kicker, it turns out that Shougo has WAY too much in common with one of them, because she's actually his long lost sister! And he has no idea which one she is! Will Shougo meet and court his Miss Right without committing something very morally wrong? Can he find his future bride without slipping into the wrong set of genes? And if his little sister does reveal herself, just how much will be revealed and under what circumstances?

(Source: Sentai Filmworks)


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Episode Videos

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Characters & Voice Actors


Nawa, Munenori
Iwanami, Yoshikazu
Sound Director
Tanaka, Motoki
Episode Director, Storyboard
Ikehata, Hiroshi
Episode Director, Storyboard

Edit Opening Theme

"Choose me♡Darling (Choose me♡ダーリン)" by StylipS

Edit Ending Theme

"Heavenly Lover" by Konoe Tsuruma (Kaori Ishihara), Miyabi Kannagi (Ayane Sakura), Rinka Kunitachi (Ayana Taketatsu), Mana Tendou (Asuka Ogame), Mei Sagara (Rina Hidaka)

More reviewsReviews

Jul 7, 2012
Andyis (All reviews)
Kono naka ni Hitori,
Unlike many other shows, the main character actually has to urgently get a wife which helps develop the plot unlike many other romance stories where the story gets no where. The twist is that he lost his childhood memories and he has a lost sister who is trying to marry him.

The main character seems like a really nice well rounded person as he is not too much of a pervert, loser or gets into too many accidents. However, as most characters do, he makes stupid decisons that piss people off. The people around him all seem to have their own unique personalities.

So read more
Aug 29, 2012
slyffer (All reviews)
In my view people are underestimating this anime.

Recommend seeing 3 episodes before of drop the anime, mysteries begin starting the episodes 2~3.
Watch 3 episodes before of give the note for the anime please.

I must also say before that if you do not like animes with hot scenes that appear panties and etc. .. you should avoid this anime, although my goal here is to give you a chance to show.

For me, the author of this work is doing a very good job at getting to have both an anime thriller with a theme so simple, I see that many people did not understand the read more
May 19, 2015
Blood_Diver_A (All reviews)
(Previously on "WHO IS IMOUTO?”)

Shougo had just came back from his father's funeral. He had learned about his large inheritance, but in order to receive it, he must attend a school and get married to a lovely girl. But, one of the girls is his long-lost sister. Shougo, heir to the Mikadono Group, knew he didn't want to bone his sister, so he became a temporary Private Investigator, searching and uncovering the identity of his long-lost sister. Will he succeed? Or will he bone his sister?

With his naive, kind, and determined personality, he ventures forth into the unknown school called Miryuin Private Academy and searches read more
Aug 7, 2015
ChucriBZ (All reviews)
Fast review.

The problem with this anime is that it was predictable, the story is good but predictable and in the 9th episode i knew who the sister was, it was obvious if you payed attention to the things they said and what they knew till that episode, and even in the first episodes i knew she was going to be the sister with another suspect that i had, but i knew it, was predictable so the story was fine.

Art & Animation
Being an ecchi harem anime this should have great art, but it was just good, nothing amazing or great, the uncensored parts were fine, Ikusu read more


Recent News

OVA of Kono Naka ni Hitori, Imouto ga Iru! Announced

According to AmiAmi online shop, an OVA of Kono Naka ni Hitori, Imouto ga Iru! was announced to be released on March 27th 2013. It will be the unaired episode 13 of ...read more

Otakon 2012 Anime License Announcements

Otakon 2012 Anime License Announcements

FUNimation announced the following new acquisitions:Isekai no Seikishi Monogatari (Tenchi Muyo! War on Geminar) Uchuu Senkan Yamato: Fukkatsu-hen (Space Battleship Y...read more

Recent Forum Discussion

Poll: NAKAIMO- favourite character polls
ZeroKamikaze - Aug 31, 2012
34 replies by Byniavo »»
Jun 11, 3:13 AM
Poll: Kono Naka ni Hitori, Imouto ga Iru! Episode 12 Discussion ( 1 2 3 4 )
Stark700 - Sep 27, 2012
180 replies by Kitsu-nee »»
May 5, 2018 8:04 PM