Nana and Kaoru / Nana to Kaoru + Fanservice compilation

This is "Ecchi anime" not hentai! The anime is based on the manga of the same name by Ryuto Amazume in 2011 at AIC plus studio.

Kaoru Sugimura has been into BDSM since childhood (*although this is a very strange hobby...), but his parents are categorically against such hobbies. And then one day, Kaoru's mother takes away his newly bought outfit from the sex shop and gives it to his childhood friend Nana Chigusa for safekeeping. The girl, being very curious by nature, decides to try on the strange costume, but accidentally closes the lock that cannot be opened without a key. In exchange for the key to the lock, Kaoru makes Nana pose for him. As a result, Nana discovers that such games improve her academic performance, and her BDSM activities with Kaoru become regular.