Ranked #3507

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
Source: Light novel
Duration: 24 min. per ep.
Rating: R+ - Mild Nudity
L represents licensing company


Score: 6.911 (scored by 38,490 users)
Ranked: #35072
Popularity: #572
Members: 72,511
Favorites: 120
1 indicates a weighted score. Please note that 'Not yet aired' titles are excluded.
2 based on the top anime page. Please note that 'Not yet aired' and 'R18+' titles are excluded.


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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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
Tendou, Mana
Tendou, Mana
Oogame, Asuka
Oogame, Asuka


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

More episodes Episodes(0/12)

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

Opening Theme

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

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)

Write a review | More reviewsReviews

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 fair.

Art & Animation
Being an ecchi harem anime this should have great art, but it was just good, nothing amazing or great, the uncensored part where fine, read more
I found this review 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
Oct 16, 2015
Oh boy. Now we're scraping at the bottom of the barrel.

You can just tell from the first couple of episodes that this anime was just made for the money making. I can hardly stand here and come up with any good things about this anime. Completely dumb story, sickeningly cliche characters, mediocre art design and soundtrack, and to top it all off, no character development at all.

Who looked at this anime and thought it was a good idea?

It might seem that I'm being a little too harsh on this show, and I can't deny that. But you have to admit that this anime series is read more
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


Anime: Princess Lover!
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
Anime: Oniichan dakedo Ai Sae Areba Kankeinai yo ne!

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
Anime: D.C.: Da Capo
-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
Anime: Ore no Imouto ga Konnani Kawaii Wake ga Nai
Both are incest centered comedy anime about a boy and his harem of teenage girls. 
reportRecommended by LittleCaesars
Anime: Nisekoi
-Both about a boy trying to find out who his "forgotten" companion is
-The atmosphere is similar in both (Light-hearted, and very short scenes of plot progression
-Both are harems
-Both take place in a school setting, both Nisekoi and NAKAIMO are realistic Slice of Lifes
-Nisekoi focuses a bit more on comedy, NAKAIMO has other things such as fanservice and ecchi
reportRecommended by BasedErio
Anime: Akaneiro ni Somaru Saka
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

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

[Updated July 18th] Summer 2012 Simulcast List

CrunchyrollMuv-Luv Alternative: Total Eclipse Territories: Worldwide (except Japan). Streaming Dates: Sundays at 10:30am starting July 1. Oda Nobuna no Yabou (The A...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, 9:01 PM
Poll: NAKAIMO- favourite character polls
ZeroKamikaze - Aug 31, 2012
32 replies by NozomiSenpai »»
Aug 17, 2:15 PM