Seifuku!せいふく!; せいふく！にっ; Seifuku! 2; Seifuku! Ni!; The High-School Uniform!; The High-School Uniform! 2

Yuusuke is a guy who loves flat-chested girls. On his first day in high school, he meets the girl of his dreams who is also his sempai, named Momoka. She asks him to join her club, which is in trouble due to the lack of members. Despite his childhood friend’s warning, he decides to join the notorious and mysterious club…