Mako-chan Kaihatsu Nikki
Japanese title: まこちゃん開発日記
Type: OVA
Episodes: 4
Source: Manga
Genres: Hentai
Studios: T-Rex
Producers: Lune-Pictures
Duration: 16 min per ep
Rating: Rx - Hentai

Kaoru-kun is a young man who has just declared himself and starts dating his childhood friend Mako-chan, she is a girl who loves to masturbate and can't wait to have sex. But maybe Kaoru-kun won't be able to be his first man in time...