When he was in elementary school, a boy who had been trying to save his childhood friend from being bullied by a bully turned violent. Now, as a junior high school student, his classmates nickname him "Kaiju-kun" and distance themselves from him. One day, a girl who is "half Kaiju" joins his class. She seems to have come to school to make friends with many people...... A heartwarming monster coming-of-age story about the pain of school life and friendship!