Ranked #3512
Kono Naka ni Hitori, Imouto ga Iru!

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
Duration: 24 min. per episode
Rating: R+ - Mild Nudity
L represents licensing company


Score: 6.931 (scored by 34024 users)
Ranked: #35122
Popularity: #550
Members: 63,505
Favorites: 110
1 indicates a weighted score
2 based on the top anime page.

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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)

Add episode Episodes

Episodes  0 / 12
Aired  Jul 6, 2012 to Sep 28, 2012
Status  Finished Airing
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Related Anime

Adaptation: Kono Naka ni Hitori, Imouto ga Iru!
Sequel: Kono Naka ni Hitori, Imouto ga Iru!: Ani, Imouto, Koibito

Characters & Voice Actors

Kannagi, Miyabi
Kannagi, Miyabi
Sakura, Ayane
Sakura, Ayane
Kunitachi, Rinka
Kunitachi, Rinka
Taketatsu, Ayana
Taketatsu, Ayana
Mikadono, Shougo
Mikadono, Shougo
Sakurai, Takahiro
Sakurai, Takahiro
Sagara, Mei
Sagara, Mei
Hidaka, Rina
Hidaka, Rina


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

Write a review | More reviewsReviews

Dec 14, 2014
Okay this is my very first review ever, so don't be too harsh for me.

When I first got my sight on this anime, I immediately thought it's gonna be boring, half-baked anime, that's what I had in my mind after seeing how low the anime is rated on MAL. But as soon as I started watching the anime, I was pleasantly surprised, it was way better than I expected it to be, in my opinion the anime is highly underrated, and deserves to be rated better.

Story: 7/10
The story of Kono Naka ni Hitori, Imouto ga Iru! was pretty good in my opinion. Sure it wasn't read more
I found this review Helpful  Not Helpful
Sep 29, 2012

The premise of Who is Imouto is just absolutely silly. Is this necessarily a bad thing? No. In fact, if you think about it, the premise of a lot of fiction is just as ridiculous, if not even more so. So what makes Who is Imouto stand out from the rest? Well, that would have to be the “squickiness” of its subject. Despite the strange, perverse (by social standards) attraction certain people seem to have for the incest genre, almost all people who have siblings will tell you that these kinds of feelings just don’t happen. Regardless, we’ll just hand-wave this point as a liberty read more
I found this review Helpful  Not Helpful
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  Not Helpful
Aug 29, 2012
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
I found this review Helpful  Not Helpful


Botht the anime Princess Lover and Kono Naka Ni Hotori , Both Male Protagonist

of these anime series are from well known Rich Family ,Also both Series Shows

the Protagonist Saves a Girl From Danger and Later Becoming Close to each other

reportRecommended by AsunaKirigaya

Both involves brocon.

Both have a the same harem, comedy and school genre.

Both involves the harem who wants to pop the guy's cherries.


In one anime the guy has to find out who among his harem is his sister, while in the other anime the guy knows who his sister is.

The guy in one anime is filthy rich, while the guy in the other anime has to run the dormitory to earn a living.

The harem in one anime lives with the guy, while the harem in the other anime lives away from the  read more 
reportRecommended by Nasty001
The main character of one Anime has a fiance suddenly sprung on him and the main character of the other Anime has to find a fiance and marry her before the term ends. The idea of the fiance living with the guy before marriage is also there and they have similar art styles. 
reportRecommended by Yemi_Hikari
Both are incest centered comedy anime about a boy and his harem of teenage girls. 
reportRecommended by SamuelLJackson
Both series feature a guy trying to figure out who his sister is. 
reportRecommended by dim100
-Both animes's setting/story goes by an omnibus format, and have small arcs for each heroine that doesn't diverge from the central plot of the story (with the setting intact) 
reportRecommended by MagicFlier

Opening Theme

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

Ending Theme

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

Recent News

OVA of Kono Naka ni Hitori, Imouto ga Iru! Announced ( 1 2 )
56 replies by xPlrac »»
10-06-12, 11:46 AM
[Updated July 18th] Summer 2012 Simulcast List ( 1 2 )
80 replies by Migzie »»
09-09-12, 3:50 AM

Recent Forum Discussion

Poll: Kono Naka ni Hitori, Imouto ga Iru! Episode 4 Discussion ( 1 2 3 )
101 replies by Yhneiil »»
05-27-15, 9:05 AM
Poll: Kono Naka ni Hitori, Imouto ga Iru! Episode 12 Discussion ( 1 2 3 4 )
171 replies by NaCro »»
04-10-15, 12:44 PM

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