Edit Anime Information
What would you like to edit?

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: 6.891 (scored by 42,660 users)
1 indicates a weighted score. Please note that 'Not yet aired' titles are excluded.
Ranked: #36872
2 based on the top anime page. Please note that 'Not yet aired' and 'R18+' titles are excluded.
Popularity: #594
Members: 80,575
Favorites: 136
Ranked #3687Popularity #594Members 80,575
Add to List
Episodes: /12


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)


No background information has been added to this title. Help improve our database by adding background information here.

Episode Videos

Related Anime

Characters & Voice Actors

Tsuruma, Konoe
Tsuruma, Konoe
Ishihara, Kaori
Ishihara, Kaori
Kannagi, Miyabi
Kannagi, Miyabi
Sakura, Ayane
Sakura, Ayane
Kunitachi, Rinka
Kunitachi, Rinka
Taketatsu, Ayana
Taketatsu, Ayana
Sagara, Mei
Sagara, Mei
Hidaka, Rina
Hidaka, Rina


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

More episodes Episodes(0/12)

No episode information has been added to this title. Help improve our database by adding episode information here.

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 11, 2012
The story is a bit original, because this guy have to marry a girl who can accidentally be his younger sister. And lucky the protagonist isn't an mediocre idiot, but still not a Don Juan.The art is good so far as i saw, good quality.
Nothing to say about the music, not bad. You must watch if you like romance, and harem. it's quite enjoyable if you look for an "ecchi comedy romance". But don't be fool and don't look for a "Clannad" or "Death Note" in this anime.
I found this review Helpful
Jul 21, 2012
Just plain trash just skip this.

The story could have been good. Its a interesting setup but it gets turned into a stupid clitche harem.

The dialogue is so bad that I actually have a hard time watching because it makes me feel embarrassed for the characters.

The storyline has no pace and is just random stuff coming out of nowhere.

I will admit tho the art and animation is pretty good but thats about the only good point.
I found this review Helpful
Aug 7, 2015
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.

[b][u]Art & Animation[/u][/b]
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
I found this review Helpful
Jul 7, 2012
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
I found this review Helpful


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

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

Recent Forum Discussion

Poll: Kono Naka ni Hitori, Imouto ga Iru! Episode 12 Discussion ( 1 2 3 4 )
Stark700 - Sep 27, 2012
172 replies by AnimaxLovers »»
Oct 25, 2015 9:01 PM
Poll: NAKAIMO- favourite character polls
ZeroKamikaze - Aug 31, 2012
32 replies by NozomiSenpai »»
Aug 17, 2015 2:15 PM