Digital Devil Story : Megami Tensei

A high-school student and skillful computer programmer named Akemi Nakajima created a software called "Devil Summoning Program". At first Nakajima intended to use the software to gain revenge on a classmate who bullied him. However, things went out of control and Nakajima summoned malicious demons. Together with his friend Yumiko Shirasagi, a transfer student, he now must fight the demons he unleashed!