From the day he was born, Tamito Ichimura's life has been filled with misfortune. Every day, he falls victim to various crimes, no matter how absurd they may be. As a result, he lives his life fully prepared for whatever might happen next. On Tamito's first day at his new school, a criminal attacks him, which is nothing out of the ordinary. However, noticing a girl passing by, Tamito attempts to save her. Furthermore, upon entering the school, he observes strange things about his classmates. He soon discovers that each of them is either a criminal or a suspect—including the girl he saved earlier. Tamito tries to run away but is gradually persuaded to continue attending. Even while constantly attracting criminals, his abnormal life will continue in this ludicrous school, as he faces many more criminal encounters, while befriending the most unexpected people—his very own unlawful classmates.