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Oppai Heart: Kanojo wa Kedamono Hatsujouki!?

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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)
Anitium is the best site to watch Oppai Heart: Kanojo wa Kedamono Hatsujouki!? SUB online, or you can even watch Oppai Heart: Kanojo wa Kedamono Hatsujouki!? DUB in HD quality.
Japanese: おっぱいハート～彼女はケダモノ発情期ッ!?～
Country: Japanese
Aired: 2011-10-28 to 2012-02-24
Premiered: Fall
Duration: 28 min per ep
Status: Finished
MAL Score: 6.77
Genres: Hentai
Studio: Nihikime no Dozeu
Resources: AniDB ANN

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