A young man has a chilling dream. He is in a cold, dark hallway, gripping a knife in his hand. But when the terrors he encounters bleed into reality, nobody is safe...

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!

Those who are resistant to death are called "Demi-humans". That day, Kei Nagai, a high-school student, should have died in a traffic accident, but he comes back to life shortly after. In other words, Kei is a demi-human. Since then, Kei's world changes dramatically. Terrified and without knowing what is going on, Kei is saved by his friend, Kai. Together, they flee deep into a deserted mountain. Later, a group of demi-humans who are hostile against humans contact Kai… Who is he fighting against? Who should he side with?