A horror mystery involving different species. The story begins when middle schooler Ryuunosuke visits his grandmother's house on an island. As Ryuunosuke walks past the stairs leading to the second floor at his grandmother's house, a strange, plant-like thing extends down from above. Intrigued, Ryuunosuke tries to climb the stairs, but his uncle stops him with an unfamiliar expression, saying, "What are you doing?" and "You'd better not go up." That night, however, Ryuunosuke's curiosity drives him to go upstairs after all...
\"Hideo... You poor thing...\" October 2nd, 2018 - a murder takes place inside a hair salon in Harajuku. The victim: fashion designer Senkawa Ai. The killer: the salon\'s manager, Masuko Hideo. Masuko has a secret. The pursuers, the pursued, and the harborer. As the mystery of the case unfolds, the darkness within each person comes to light.