Tokyo Shiniki: Closed Eden

Two years have passed since the transformation of Tokyo. Highschool student Akizuki Renji along with the popular idol Yumiie Kanata became "invaders" whose job is to invade "Critical Zone: Tokyo." At the dead city known to be controlled by "the enemies of mankind." Can the promise sworn between Renji and Kanata be fulfilled!? (Source: Translated from official description)