High schooler Sota has an unusual "possessed constitution"!? Introduced by his friend, he nervously starts part-time work at a detective agency. The brothers who founded the agency, once known as three hugely successful detectives, take possession of his body one after the other. The oldest brother uses logic, the second brother uses disguises, and the third uses his strength! Sota has transformed into the invincible detectives. What is the next tough case that they will be faced with...