High-school girl Yuri suddenly finds herself on the rooftop of a high-rise building. She's trapped in a bizarre world surrounded by skyscrapers, where a masked man cracked open a man's head with an axe before her eyes. The original author of "Ajin," Tsuina Miura works in collaboration with Takahiro Oba, the artist of "Box!", to bring you this thrilling skyscraper suspense!