Futaba Shimeru thinks he's a normal high school boy. He nurtures a crush on a girl from his class, and he hones his skills in the wrestling club. All very normal... but there's something his family hasn't told him. A minor thing, really. Every member of his family has a genetic oddity: after a certain age, when they are upset or stressed, they switch genders. Nobody told Futaba-kun, and one day, at school, he's old enough to learn the hard way.
This manga appeared in Japan in "Shounen Jump Monthly" and has been completed in 8 compiled volumes.