Renn Kiriyama is an unsociable, 22 years old upcoming fighter and university student with a dark past. One night, he has a dream where he wakes up in a dark sewer inhabited by grotesque creatures. As he succeeded in escaping the sewer, he meets up with his loved one, Haruka Kurashina. She tells him that the world has ended and he has to save the world, no matter what. And with that, his first nightmare ends.

Renn Kiriyama is an unsociable, 22 years old upcoming fighter and university student with a dark past. One night, he has a dream where he wakes up in a dark sewer inhabited by grotesque creatures. As he succeeded in escaping the sewer, he meets up with his loved one, Haruka Kurashina. She tells him that the world has ended and he has to save the world, no matter what. And with that, his first nightmare ends.