Yamada is a dull office worker in his forties. He releases stress from work and family by bumping into anyone he meets on the street. That's the only way he feels superior. One day, on his way to school, he bumps into Ruru, a high school girl with a strong sense of justice, earning her intense anger. For the first time, Yamada can no longer bear the derogatory words "You're the worst! You're disgusting!" He finds a hypnotizing device online...