Synopsis

Beyond a hidden panel in Tachibana's Sweet Shop, Asumu discovers the Oni R&D laboratory. There, Midori sheds light on Hibiki’s forgotten history. Elsewhere, Hibiki believes he has unlocked the key to defeating the Armored Douji and Hime, meticulously timing their transformations. But urgency presses him; a Nurikabe is advancing towards the village nestled below the mountain.