Akemi Nakajima, a high school student with exceptional computer programming skills, encounters Yumiko Shirasagi, a new classmate who seems familiar to him. Despite her sense of recognition, Yumiko doesn't initially address it. Following school hours, Nakajima and a few peers engage in a ritual to summon the devil, resulting in the appearance of Loki on the computer screen with a female sacrifice. How will Yumiko, who witnessed this eerie event, navigate the unfolding circumstances?