The notorious Shounen Bat is terrorizing the residents of Musashino City. Skating around on rollerblades and striking people with a golden baseball bat, the attacker appears impossible to catch, let alone comprehend. His first victim, the famous yet timid character designer Tsukiko Sagi, is suspected of masterminding the attacks. Believed only by her anthropomorphic pink stuffed animal, Maromi, Tsukiko is merely one of Shounen Bat's many victims. As Shounen Bat continues his relentless assault on the town, detectives Keiichi Ikari and Mitsuhiro Maniwa begin investigating the attacker's identity. However, more and more people fall victim to the infamous golden bat, and news of the assailant begins to circulate throughout the town. Paranoia starts to set in as chilling rumors spread among both adults and children. Will the two detectives be able to unravel the truth behind Shounen Bat, or will the paranoia get to them first?