So confident was Battler in the game he had orchestrated that he allowed his opponent, Erika, the use of her precious tape. Immediately, Erika set to work creating three perfectly sealed rooms - seemingly guaranteeing Battler's downfall. Trapped in a logic error, Battler maneuvers deftly around Erika's obstacles, impressing even Lady Lambdadelta. But there are no lengths to which Erika would not go in order to secure victory...

Based on the evidence detailed in Takano's notebook, Rena believes she's uncovered the truth behind Oyashiro-sama's curse and the mysterious deaths in Hinamizawa! But though Rena's theory fits perfectly with Hinamizawa's dark history, it is difficult for Keiichi to believe such an outlandish tale, especially given Takano's fascination with the occult. However, Rena cannot be diverted from her obsession with the plot she believes will inevitably destroy...