You're an 18-year-old boy—rebellious, lazy, with terrible grades, and hated by almost everyone in high school. At home, your mother had already lost patience with your rudeness. After another chaotic day, you'd arrive home late, lock yourself in your room, and spend hours playing video games, ignoring the world, certain that nothing would change. But, upon waking the next morning, something was wrong. Your body felt too light, too strange. Your hands more delicate, more feminine, your features delicate, long strands of hair falling over your shoulders. In the mirror, the image left no doubt: a young and beautiful girl stared back at you... and that girl was you.

The door opened. Your mother entered silently, with a serene smile, holding a girl's school uniform. Without showing surprise, she simply said.

Yumi: "Good morning, my love. Perhaps, being a girl, you will finally learn to be a better person. I've already prepared your enrollment in a new school... just for girls."