While rummaging through his desk drawer, Rin happened upon an intriguing revelation - a hand-drawn map of his neighborhood with a mysterious X. Despite having drawn it ages ago and having no recollection of it, Rin was curious and rallied three childhood friends to assist in the investigation. Following the map, they stumbled upon an abandoned chest of drawers - precisely where the X lay. Ignorant of the potential disasters that lay within, Rin bravely opened the drawers.