![](https://cdn.animecharacters.io/images/anime/large/6459-46dff3e8.jpg)
Format
OVA
Episodes
2
Episode Duration
28 min per ep
Status
Finished Airing
Premiered
Aired
2011-10-28 to 2012-02-24
Source
Visual novel
Rating
Rx - Hentai
Genres
Hentai
Studios
Nihikime no Dozeu
Producers
Licensors
Oppai Heart: Kanojo wa Kedamono Hatsujouki!? (おっぱいハート~彼女はケダモノ発情期ッ!?~)
Ryuya has an older sister, Miya. He lives a peaceful school life with his friends. But one day, he and his friends accidentally drink a medicine juice. Once you drink it, you'll become sexually sensitive and get excited. The breasts of the girls who drink it will get bigger and they will need to have sex to cool down. Also, to make a vaccine, they will need to get pregnant. Ryuya starts having sex with the girls to cool them down and make a vaccine. (Source: ErogeShop)