Ep. 1: New semester brings Nagasumi to Class Zero and Lunar's father causes chaos

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The new semester starts with Nagasumi, San, and others as third-grade seniors. While most students remain in their original class, Nagasumi is transferred to eighth middle school, class zero, a room filled with delinquents. His new homeroom teacher, Shark Fujishiro, struggles to control the unruly students and threatens violence on the first day. Simultaneously, a new student joins Sun and Lunar’s class, revealed to be Lunar’s father dressed in female middle school attire and an apron. This appearance disgusts Lunar, causing a major disturbance. When Seto Gozaburo attempts to restore order, Lunar’s father refuses to back down, leading to a physical altercation. To resolve the situation, Lunar and Sun leave their classroom to find Nagasumi and return him to his seat.