This is a spinoff of “Nana & Kaoru”. The story takes place in the third year of high school, after the ending of the manga, but before Black Label (aka Arashi).
Nana to Kaoru ~Koukousei no SM gokko~
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Warning, the series titled "Nana to Kaoru ~Koukousei no SM gokko~" may contain violence, blood or sexual content that is not appropriate for minors.