In a peaceful Japanese town, schoolgirl Sakura (Higarino) finds her life shattered when the men in her community begin brutally attacking the women. With only her kyudo bow for defense and an English textbook for solace, Sakura navigates a chaotic, apocalyptic landscape. The trauma of witnessing the violent deaths of her loved ones pushes her toward insanity, leading her to escape into a vivid dreamworld. There, she encounters Billy (Mackenzie), a character from her English book, who aids her in surviving not only the murderous zombies but also the more dangerous adversary, Aoi (Tsujimoto). As she races to uncover the real-world Billy and the truth behind the chaos, Sakura seeks answers to the pressing questions: What is causing this nightmare, and who or what is responsible?