城院小学校の生徒たちを束ねる不良少年・てつし、てつしの右腕・りゅうちん、そして時々味方になる津田の3人は、町内で誰もが知る「悪ふざけ三王」。 Tetsushi (a 5th grader delinquent who rules over the students of Jouin elementary), Ryuuchin (Tetsushi's right hand man) and Tsuda (their sometimes-ally), are known to everyone in town as the "three evil prankster kings." In a creepy pharmacy located out-of-town, the boys meet an old man who bestows a strange and other-worldly power upon them. Soon after, our 3 young pranksters find themselves battling a variety of ghosts and demons...!?