Kouichi Sakakibara has just arrived in Yomiyama, and he's already hospitalized with a collapsed lung. After joining the local middle school almost a month late, he becomes friends with someone he met while in the hospital — a quiet girl with an eye patch.

Following Mizuno's bizarre accident, the tension rises in Class 3, and Izumi is chosen as the new Class Officer without Kouichi knowing. Rumors are spreading, but no one is willing to say anything.

An unexpected accident outside Yomiyama once again puts Class 3 on edge. After Matsunaga's vague whispers point to the classroom, Kouichi decides to investigate the old Class 3 homeroom in the former school building.