Mina, who has a tomboyish personality, is currently living with her boyfriend. Their lives seemed to be going smoothly... but her boyfriend is weak and flabby, and Mina secretly feels uneasy. She has to lead the sex, and he doesn't want to go to work. She loves him, but he is completely opposite to herself. "Ah, if I was born a man..." One day, when Mina wakes up, she feels something strange in her crotch. When she timidly pulls back the covers, there is a healthy erect dick growing there...!?
