Ushinawareta Mirai o Motomete by TRUMPLE (rus)

In recent years, an increase in the number of students has been observed at the Uchiha Academy, and a new school building has been built. The story originates during the last festival in the old school building. All the club leaders decided to do everything to make this festival the best in the history of the school. Sow is a member of the notorious astronomy club, which basically solves various issues instead of stud. advice.
One day, until late at night, he remains at the school medical center, as he was slightly injured in classes at the judo club.
Suddenly the building shook. Shocked, he runs up the stairs, where he thinks the epicenter is, and there he meets a mysterious naked girl who recognizes him at first sight.
The next day, this girl, Yui, appears in the club of astronomy, expressing her desire to join him.