迷子の妹を送り届けた着ぐるみの中の人が俺だと知ったクラスのマドンナがぐいぐいやって来る (Associated Names)

The story is about the main character, a gloomy loner, who is spotted by the beautiful girls at the center of two major girl groups in his class and is left to do as they please. [We’re breaking up.] On the first day of Golden Week, I, Tahara Hikaru, was told this by my childhood…