Kono Naka ni Hitori, Imouto ga Iru!

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]

Tsuruma, Konoe Main

Ishihara, Kaori Japanese

Kannagi, Miyabi Main

Sakura, Ayane Japanese

Kunitachi, Rinka Main

Taketatsu, Ayana Japanese

Sagara, Mei Main

Hidaka, Rina Japanese

Tendou, Mana Main

Oogame, Asuka Japanese

Mikadono, Shougo Main

Sakurai, Takahiro Japanese

Mizutani, Ikusu Supporting

Koshimizu, Ami Japanese

Kannagi, Kazuma Supporting

Nakata, Jouji Japanese

Houshou, Yuzurina Supporting

Ogura, Yui Japanese

Kotori, Maiko Supporting

Noto, Arisa Japanese

Kuroda, Yasuhiro Producer

Ishizuka, Masatoshi Producer

Yoshinuma, Oshi Producer

Koike, Katsumi Producer

Reviews

May 31, 2025

LegionIscariot

Recommended

"NAKAIMO - My Little Sister Is Among Them!" is an imouto harem about a boy Shougo who is supposedly an only child.
But after his father's death he is mysteriously contacted by someone who claims to be his little sister.

At his new school Shougo is approached by cute girls, any one of which could be his sister. So he must try to control his desires and fight off temptation lest he ends up in a forbidden relationship with his brocon little sister.

Its an entertaining anime (if you're into brocon/siscon).
Alot of harems tend to have very dull girls but not here. The girls are written ... to be very entertaining. A bad tsundere can make or break a good harem but thankfully here the tsundere is done well too. So all the characters are likeable.
They also show tits 👍
There is even a reverse-trap (a girl who dresses up as a boy). Every good harem needs a trap.

This anime is very similar to Sister Princess. An anime about a boy who moves to a new school on an island to find out he has 12 sisters who want to marry him.

You'd think this would just be your straightforward ecchi harem. But its also mystery with some twists.
It does have some boring filler though.

Reviewer’s Rating: 7

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Sep 12, 2021

Gregory_Senpai

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, ... and find a wife… but, the catch is that his little sister, the illegitimate child of his father, also goes to the school; so, he’s gotta find a wife, and not ALSO bang his sister by accident in the process.

This is a fan-service loaded, echi, rom-com anime that can’t decide if it’s for the incest, or against it. Honestly, I’m not a big fan of little sister incest plots. They have a bad tendency to come off as really weird, and fetishist most of the time. This time, it was even weirder when they’re passing around literal DNA tests trying to determine who the MC’s related to by blood.

So, honestly, I question why I continued the show. I found that there were three reasons why I didn’t drop it and give it a 2 or a 3.

1. I was perplexed that I’d seen this and didn’t remember it at all, and didn’t want to admit that I’d checked it as complete without seeing it at all.

2. Once I started watching it, the plot actually did leave me guessing, because it seemed to be wrapping each question inside another question and leaving so many different flags, and red herrings that I couldn’t make heads or tails of what’s what.
And the last reason is probably the most critical…

3. The voice cast of this show is perplexingly loaded with all-star seiyuu on the Japanese side (no idea about the dub, I watched the sub).

Keep in mind this series came out in 2012, so for some of these people this was fairly early on in their career, for others, not so much.

The main character is played by Takahiro Sakurai (Reigan Arataka, Oshino Meme, Suzaku Kururugi), a VA legend, who’s been been in the business for a LONG time. He’s surrounded with female actresses who’ve also played some huge roles:

Koshimizu Ami (Kallen Satdtfeld, Holo, Matoi Ryuuko)

Ayane Sakura (Uraraka Ochako, Nakano Yotsuba, Gabi Braun)

Kaori Ishihara (Souta from Dragon Maid, Aladdin from Magi, Murayama from DxD)

Rina Hidaka (Milim Nava, Last Order, Filo)

Ayana Taketatsu (Nino Nakano, Kirino Kousaka, Azusa from K-ON!)

So in the end, what kept me from dropping this show was the voice cast for the most part. It was so crazy loaded with talent that I couldn’t pull myself away and forced myself to finish it, even though I didn’t really get any satisfaction out of the ending or the plot.

So, I don’t really recommend watching this, unless you want to witness some VA’s in roles they’re DEFINITELY not known for. If you’re kind of a seiyuu nut, like I am, than watching this, and listening to their performances will leave you scratching your head, but will prove to be a moderately pleasurable experience. Hopefully I’ll remember I watched this series better now that I’ve written a review about it.

If you decided to watch it, it can be found streaming on Hidive.

Reviewer’s Rating: 5

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Oct 4, 2021

AnimeEnjoyer420

Not Recommended

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 ... company. If this sounds like the setup for an unusually plot-heavy porn video, I can assure you that it's not written much better than one and has almost as many bare breasts. Though I won't spoil who, you do eventually get an answer to the question of "who is the sister?", but no answer to the question of "who does Shogou marry?". The 13th episode OVA strongly hints at a particular outcome to the latter question, but if you're looking for a scene where one character "wins", you won't find one here.

Inconclusive romance aside, the real sin here is the mystery of the sister, which sounds like an interesting twist on an otherwise generic harem series on paper. However, the mystery itself is so convoluted and poorly written that you should abandon any pretense of trying to solve the mystery yourself. There are multiple fakeouts where characters pretend to be the sister that make no sense at all unless you view them purely as red herrings, because they really don't have any reason to be pretending to be the sister except to fool the audience at home. It takes a bunch of pointless turns, new characters and evidence get introduced out of the blue as plot twists, rendering any attempt to figure out what's going to happen next an exercise in futility. After a few episodes of this, I was just checked out completely on the mystery and did not care who the real sister ended up being. If it was at least interesting, I could forgive some of the bad writing here, but it just ends up being confusing and boring.

Audio/Visual: Below average in both respects. The animation is stiff and generic, and the VA work is subpar for most of the characters. It feels like barely anyone that made this thing was putting in any effort. However, the girls are cute and they're topless pretty frequently, so if you're into that sort of thing, you'll probably enjoy that aspect of it at least.

Characters: All the harem tropes you know and loathe are here. Pervert MC that freaks out at a girl getting close to him but always manages to somehow fall on top of girls and grab their boobs in the process? Check. Tsundere that beats up the MC for seeing them in a compromising situation even though it was their fault? There are 2 of them actually. Girls having literal contests with each other for the MC's affections? Almost every episode. It's almost shocking how cookie-cutter the characters are. Of the main girls vying for Shogou's affections, Konoe is your typical childhood friend, Kannagi is your typical tsundere loli, and Kutunagi is your typical ice queen ojou-sama. There is nothing more to any of them than that. The only sort-of exception is that Konoe initially shows a bit of a playful prankster side that's kind of refreshing, but even that is quickly squashed flat and barely mentioned after a few episodes. Shogou himself is a total blank slate harem protagonist, although somehow even denser than usual and constantly causing problems by jumping to wrong conclusions in the sister mystery. The only characters that are even mildly entertaining are the peripheral members of the harem, the food-obsessed student council president Tendou, and witch-cosplaying senpai Sagara. Neither of them have any romantic chemistry with Shogou and seem to be almost reluctant harem members, showing only token interest in a relationship with him. Thankfully that frees them from the cringeworthy antics of the 3 main competitors and gives them space to just be goofy weirdos that provide the sole moments of entertainment to be found anywhere in this godforsaken series.

Reviewer’s Rating: 1

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Oct 4, 2021 3:39 PM by Aiimee | Discuss (5 comments)

	Season 2 Ahmeteemin - Aug 16, 2021	6 replies	by Kaneki456 »» Jul 11, 2024 7:17 AM
	Poll: Kono Naka ni Hitori, Imouto ga Iru! Episode 1 Discussion ( 1 2 3 4 ) Uiriamu_Busujima - Jun 28, 2012	155 replies	by Netbug »» Dec 10, 2023 9:10 AM
	Poll: Kono Naka ni Hitori, Imouto ga Iru! Episode 12 Discussion ( 1 2 3 4 ) Stark700 - Sep 27, 2012	187 replies	by yveltalkyogre »» Dec 30, 2022 7:39 AM
	small question fricksalot - May 31, 2021	13 replies	by Rnonsenseguy »» Aug 10, 2022 6:43 AM
	What if it turns out they were all his sister! Guts-Valley - Jul 5, 2022	8 replies	by tmsy »» Jul 6, 2022 6:55 PM