​Welcome to Zasshono Academy, a prestigious private school with over 54,000 students spanning from elementary to high school. At this extraordinary institution, there is a club like no other – the Eiken Club. Surrounded by an air of mystery, this club consists exclusively of headstrong and overwhelmingly busty female students, including the brilliant Shinonome Chiharu, who achieved the highest entrance exam score. When Mifune Densuke, a new high school student, is unexpectedly coerced into joining the Eiken Club, his once ordinary life is instantly transformed. Prepare for a whirlwind of passion, romance, and endless mischief in this captivating tale of love and chaos! Enter the world of Eiken Club and experience a high school adventure like never before.​