Fourteen year old Miki becomes pregnant with her boyfriend's child. After struggling with the fact that she is pregnant, she decides to keep the baby and raise it.
Hina moves schools often due to her dad's job. Her dream of a normal high school life is shattered when she realizes her new class consists only of boys. Additionally, five mischievous boys from her class develop an interest in her.
Mizuki disguises herself as a boy and transfers to the same all-boys high school her idol, Izumi Sano, a high-jump athlete that gave up on the sport, attends. In between the antics of their classmates, she'll try to get him to jump again.