Nana to Kaoru – Kokosei no SM gokko

Nana and Kaoru are now third-years in high school, and tests are heating up. However, their ”breathers” are also heating up. The story takes place in the third year of high school, after the ending of the manga, with Black Label (aka Arashi) occurring during summer vacation.

The tankoubon collection for this series is labelled as "Last Year."

Prequel: https://bato.to/title/38273-nana-to-kaoru
Side Story: https://bato.to/title/38298-nana-to-kaoru-arashi