彼女になる日

Miyoshi has spent his whole life losing to Mamiya, the childhood friend who beats him at everything. In their world, a phenomenon called emergence turns some boys into girls to hold the male-to-female ratio steady, and at seventeen, after weeks in the hospital, Mamiya comes back to school emerged as a girl and ready to live as one. Miyoshi, who is terrified of women, now has to face his lifelong rival as one of them.