Kono Naka ni Hitori, Imouto ga Iru!

NAKAIMO - My Little Sister Is Among Them!

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Alternative Titles

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


Type: TV
Episodes: 12
Status: Finished Airing
Aired: Jul 6, 2012 to Sep 28, 2012
Premiered: Summer 2012
Broadcast: Fridays at 01:55 (JST)
Producers: Lantis, TBS, DAX Production
Licensors: Sentai Filmworks
Studios: Studio Gokumi
Source: Light novel
Genres: ComedyComedy, MysteryMystery, RomanceRomance, EcchiEcchi
Themes: HaremHarem, SchoolSchool
Duration: 24 min. per ep.
Rating: R+ - Mild Nudity


Score: 6.511 (scored by 9958199,581 users)
1 indicates a weighted score.
Ranked: #65802
2 based on the top anime page. Please note that 'Not yet aired' and 'R18+' titles are excluded.
Popularity: #1117
Members: 209,554
Favorites: 257

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Ranked #6580Popularity #1117Members 209,554
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Episodes: /12


Shougo Mikadono's father has just passed away, and now he must become the head of Mikadono Group, his father's company. After completing the training to take over, there is just one other stipulation he must adhere to: he will need to find a girl he loves at his new school and marry her by the time he graduates high school.

Shougo transfers to Miryuin Private Academy, and it seems like he has many girls to choose from, such as Konoe Suruma, the class representative as well as his first new friend; Miyabi Kannagi, a standoffish but kind girl; Rinka Kunitachi, the student council vice president; Mei Sagara, who runs a cafe and dresses like a witch; and Mana Tendou, the student council president. However, there is a complication: one of them is his long-lost half sister, and he has no idea which one, so how can he become romantically involved with any of them?

[Written by MAL Rewrite]


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Related Anime

Characters & Voice Actors


Shibata, Tomonori
Producer, Planning
Yoshinuma, Oshi
Nawa, Munenori
Iwanami, Yoshikazu
Sound Director


Opening Theme

Apple Music
Amazon Music
Youtube Music
"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)


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 ...
Aug 7, 2015
Mixed Feelings
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 ...
May 19, 2015
(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 ...

Interest Stacks


Recent News

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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

Recent Forum Discussion

Poll: Kono Naka ni Hitori, Imouto ga Iru! Episode 12 Discussion ( 1 2 3 4 )
Stark700 - Sep 27, 2012
188 repliesby rsc-pl »»
Jan 6, 9:49 AM
Season 2
Ahmeteemin - Aug 16, 2021
5 repliesby yveltalkyogre »»
Dec 30, 2022 7:40 AM
small question
fricksalot - May 31, 2021
13 repliesby Rnonsenseguy »»
Aug 10, 2022 6:43 AM
What if it turns out they were all his sister!
Guts-Valley - Jul 5, 2022
8 repliesby tmsy »»
Jul 6, 2022 6:55 PM
Poll: Kono Naka ni Hitori, Imouto ga Iru! Episode 3 Discussion ( 1 2 3 )
Stark700 - Jul 19, 2012
127 repliesby Summer111a »»
Aug 10, 2021 9:45 PM