Yuto Kanzaki, a young man working at an orphanage, lives a peaceful life looking after the children while secretly harboring feelings for his childhood friend, Chika. But everything changes in an instant when "Exeedra"—a notorious terrorist organization that once terrorized the world—suddenly resurfaces. Rioters and sinister executives targeting Chika launch a brutal assault on the orphanage, unleashing overwhelming violence upon Yuto! In a desperate, life-or-death crisis, as his fury over Chika being harmed boils over, a mysterious, berserker-like power awakens deep within him—!