Akemi Nakajima is a high school student with a genius talent for computer programming. One day, Yumiko Shirasagi transfers into his class. She feels she knows Nakajima from somewhere, but doesn't try to deal with it. After school, Nakajima and a couple of classmates hold a ceremony to summon the devil. Nakajima summons the devil Loki on the computer display while presenting a female offering. What will happen to Yumiko, who witnessed the scene?