When Yihwan woke up, the world had changed. Zombies roamed the streets, thirsting for human blood, while the living fought desperately to survive. But… "Why aren't the zombies biting me?" With an unnatural strength surging through his body, one eye glowing red like the undead, and a strange hunger rising at the sight of blood... "What... happened to me?!
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...