Ranked #4492

Boku wa Imouto ni Koi wo Suru

Alternative Titles

Synonyms: I'm My Little Sister's Secret, I'm in Love With My Little Sister
Japanese: 僕は妹に恋をする


Type: OVA
Episodes: 1
Status: Finished Airing
Aired: May 18, 2005
Producers: Y.O.U.C
Source: Manga
Genres: Romance, Shoujo
Duration: 49 min.
Rating: R+ - Mild Nudity
L represents licensing company


Score: 6.641 (scored by 14,866 users)
Ranked: #44922
Popularity: #1511
Members: 23,435
Favorites: 91
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.


Yori and his twin sister Iku used to be very close as children but lately Yori has grown colder toward Iku and is always eager to stay away from her. Iku was confused by Yori's attitude. Actually Yori is in love with Iku and that forbidden love is causing Yori sleepless nights since Yori and Iku are sharing the same room with bunk beds. Yori tried to ease his intense desire for Iku by bedding Iku's best friend. He had even applied to attend a boarding school in another city to take him far away from Iku. Yori lost his resolve to stay quiet about his feelings when Iku started to talk about having a boyfriend and going on dates. Now Yori want to have his little sister and he confessed. Iku loves her big brother and wanted them to stay together, so Iku is willing to anything to keep them together. But Yori wanted to have Iku as a lover, not as a sister loyal to her twin.


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Related Anime

Characters & Voice Actors

Yuuki, Yori
Yuuki, Yori
Morikubo, Showtaro
Morikubo, Showtaro
Takagi, Reiko
Takagi, Reiko
Yuuki, Iku
Yuuki, Iku
Nakahara, Mai
Nakahara, Mai
Yano, Haruka
Yano, Haruka
Toriumi, Kousuke
Toriumi, Kousuke
Yuuki, Saki
Tamagawa, Sakiko
Tamagawa, Sakiko


Aoki, Kotomi
Aoki, Kotomi
Original Creator
Machida, Touko
Machida, Touko
Tsuchihashi, Makoto
Tsuchihashi, Makoto
Art Director
Ueda, Susumu
Ueda, Susumu

Opening Theme

"Boku Wa Imouto Ni Koi Wo Suru - OP" by Susumu Ueda

Ending Theme

"Ai ga Hoshii" by Shion

Write a review | More reviewsReviews

Nov 7, 2015
How to describe Boku wa Imouto ni Koi wo Suru . . . This was purely a fan-service piece to say the least. Is it bad that I secretly enjoyed it?

I didn't read the manga, if there is one; I simply stumbled upon this. Still, in regards to STRICTLY THIS FILM, the plot leaves little room for development and what is there is slightly underdeveloped. The characters go from one extreme to the other, and the relationships in this film are too heavily focused on the sexual aspect, not necessarily on the development and blossoming of love or otherwise.

Nevertheless, I can't help but read more
I found this review Helpful
Aug 22, 2015
Boku wa imouto ni koi wo suru, which can be translated as “I’m in love with my little” sister brings to us the controversial topic of incestuous love between fraternal twins. This subject will probably upset those with strictly religious moral values or at least those with anything against incest. This anime tells you the story of Iku and Yori, two fraternal twins of opposite genders, who despite being incredibly close to each other during their childhood started to grow apart as both grow up due the forbidden feelings Yori has for Iku.Finally, Iku gets a boyfriend when Yori had in mind to study abroad. read more
I found this review Helpful
Sep 13, 2009
Okay this is my first ever review written so please bear with me if my review writing skills aren't top notch. I was compelled to write a review for this OVA as the ratings of other reviews confused me as whether this was a outstanding OVA or mediocre. So here it goes:

Boku wa Imouto ni Koi wo Suru is I'm in Love with my Little Sister in english and from the title we can already see where this OVA is heading. The story doesn't incorporate many different elements to fully flesh out the story however considering the length of the OVA it is very much read more
I found this review Helpful
Feb 22, 2009
Ok I've watched close to 80 different anime, all types, and one thing I've learned is that you cant judge until you watched the whole thing. However, when I heard of "I Love My Younger Sister", I was skeptical. I mean, there are some messed up anime out there, but a story about twins not wanting to love each other as siblings but as lovers? Now thats messed up, but when I saw reviews and thought about it I decided, "What's the harm?". And when I finally watched it, Wow! What a amazing story! Ok, it was beyond depressing, but it was still really good. read more
I found this review Helpful


Anime: Yosuga no Sora: In Solitude, Where We Are Least Alone.
Both involve love between a twin brother and sister. 
reportRecommended by yaoiisgood
Anime: Koi Kaze
Two anime that deal with incest without glorifying it, or attempting to pander to those with a fetish for such things.

People are often put off Koi Kaze due to the age gap between the older brother and much younger sister. Boku wa would probably appeal more to those people because the siblings are twins.

In both stories the leads try to fight off their romantic, lustful feelings for their sisters; ultimately failing to do so. And in both it's made crystal clear how society views incest and the hardships brothers and sisters in love must face. Neither title is smutty... though, going  read more 
reportRecommended by AironicallyHuman
Anime: Aki-Sora
both contain the same style but unlike the innocent Aki, the protagonists of Boku Wa is more serious in their choices, the brothers live with their parents and friends during the story, what is something that does not contain in Aki-Sora, the fine is and as dramatic as the note is the same, 10 
reportRecommended by Servantes
Anime: Tenshi Kinryouku
Both animes have brother/sister incest motive, with the brother being in love and the sister submitting to him out of devotion. Angel Sanctuary, though, has a lot of additional interesting stuff, Boku wa Imouto is a pure realistic drama. 
reportRecommended by Juxian
Anime: Kuro to Kin no Hirakanai Kagi.
Both stories are about love between two siblings aka incest, especially with the brother trying to hide his feelings for his sister. 
reportRecommended by Northen_Lights
Anime: Vampire Knight
Both have incestuous themes; forbidden love between a younger sister and older brother. 
reportRecommended by RRamaII

Recent News

Recent Forum Discussion

Poll: Boku wa Imouto ni Koi wo Suru Episode 1 Discussion
Teddy - Jul 18, 2008
31 replies by Estherella »»
Oct 7, 11:43 PM
Forbidden Love?
Lilly1x - Feb 8, 2009
10 replies by sonictoryuiai »»
Jan 16, 3:18 PM