Akemi Nakajima, a high school student possessing remarkable computer programming abilities, welcomes transfer student Yumiko Shirasagi to his class. Although Yumiko experiences a sense of recognition toward Nakajima, she chooses not to investigate it. Later, once school lets out, Nakajima and a few classmates carry out a ritual meant to summon a demon. Through his computer, Nakajima successfully conjures the demon Loki, accompanied by a female offering. The unanswered question is what fate awaits Yumiko, who witnesses this happening.