The gang is trapped inside the school, fraught with students-turned zombie and a steadily growing tension between Z-loan and A-Loan. The cabin fever reaches an all-time high when Chika loses his senses and resorts to cannibalism. Shito and Michiru enter his subconscious in the hopes of finding the source of Chika's distress. What they find are disturbing, buried memories of Chika's childhood.