Ren Arakawa thought he was transferring to a prestigious boarding school.

Instead, his parents tricked him into enrolling at Seishin Elite Academy for Young Ladies—a world-famous all-girls school that has completely banned male influence for generations.

Now, as the academy’s first and only male student, Ren finds himself surrounded by curious, confused, and occasionally hostile girls who have never interacted with a boy before. Every step he takes is monitored as part of a social experiment meant to study male behavior.

Making things worse, the academy’s terrifying vice principal is convinced that boys are nothing but trouble. She watches Ren like a hawk, waiting for the smallest mistake to get him expelled.

And there’s one rule he absolutely cannot break:

If Ren forms a romantic relationship with any student… he’s out.