In a society afflicted by an enigmatic illness that mutates one's physical form and mental state into that of a creature, the irrepressible and unavoidable Beastification Syndrome plunges its victims into terror. Those contaminated are sequestered by the "Ministry of Health" staff. Amidst a world where embracing one's inner beast equates to the termination of everything they know, Kazu is informed of his comrade Masa's transformation. Hesitant yet resolute, Kazu deliberates... How much longer will you maintain our bond, my closest confidant—Their shared destiny, rived by an inscrutable scourge.