Is Mako-chan Kaihatsu Nikki hentai?
Yes
Rated Rx (Hentai) on MyAnimeList.

OVA · 2021 · 4 episodes · Rx - Hentai
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...
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