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 9959499,594 users)
1 indicates a weighted score.
Ranked: #65842
2 based on the top anime page. Please note that 'Not yet aired' and 'R18+' titles are excluded.
Popularity: #1118
Members: 209,585
Favorites: 256

Available At


Ranked #6584Popularity #1118Members 209,585
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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)


Aug 31, 2021
The ecchi scenes were marvellous, they were very erotic and some of them were coated with a touch of romanticism that made this anime stand out from the rest. Unfortunately all this build up gets thrown out of the window by the stereotypical "friend" or "event" that ruins the mood, nevertheless still a very enjoyable show.

The girls were really pretty and hot, I wish more anime studios weren't afraid of showing nudity as ten years ago... good old days.

Nakaimo gives you a good ending, no the best but still a good one, in my opinion you wont be disappointed considering how the plot developed ...
Sep 12, 2021
Mixed Feelings
Nakaimo is basically as average as you can get. So average in fact, I forgot everything about it, including having already seen it, and watched it again. I had this marked as completed on MAL for who-knows-how-long, but could recall literally nothing about it, including the answer to the titular question, “who’s the MC’s little sister?”

This is a PLOT heavy show that is heavy on actual plot. The premise is that the main character’s father has passed away, and he’s soon to become the head honcho at his dad’s company, so he’s going to attend a new, elite school, where he’ll become a refined, adult, ...
Oct 4, 2021
Recommendation: Harem garbage mixed with one of the worst mysteries you'll ever see. Don't waste your time. Some spoilers below.

Story: High school student Shogou is being set up as the heir to his father's company, but is given the instructions that he must find a wife by the end of the year to inherit it. Complicating this is the fact that he has a mysterious little sister who is attempting to be the woman he marries, so he tries to find out who the sister is before deciding on a wife because marrying his blood relative would create a scandal for the ...

Interest Stacks


Recent News

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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