A modern world where various humanoid species co-exist, Human, Animalia, Undead, Vampire and Elf. A certain event triggered a dangerous button which forced a war to happen 3 years ago. The 2 years prolonged war was finally over when Japan proposed a peace conference by creating the group called Coupe.

Coupe is stated in history to be the 'saviour' of the world, but there are dark sides of the story that only few knows.

The story takes place around the remnants of the Coupe that live their life after the war. Hiroaki Kuznetsoz, one of the members is working as Jack-of-All-Trade in underground world merely for his greedy desire. One day, a girl comes with a request, soon becomes his girlfriend and solves the mystery behind the request together, along with their untold secrets that they refuse to tell each other.