Digital Devil Story: Megami Tensei
Japanese title: デジタル・デビル物語〈ストーリ〉 女神転生
Alternative titles: Digital Devil Monogatari Megami Tensei
Type: OVA
Source: Light novel
Episodes: 1
Status: Finished Airing
Aired: Mar 25, 1987
Duration: 45 min
Rating: R - 17+ (violence & profanity)
Studios: animate Film
Producers: Movic, Tokuma Shoten, Tokuma Japan
Genres: Adventure, Drama, Fantasy, Horror, Mystery, Supernatural
Themes: Mythology, Psychological, School

Akemi Nakajima, is a high school student with a genius talent for computer programming. 
One day, Yumiko Shirasagi is transferred to the same class as him. She feels she knows Nakajima from somewhere, but doesn't try to deal with it. After school, Nakajima and a couple of classmates held 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?

(Source: Official site, edited)

Digital Devil Story: Megami Tensei is an adaptation of the first of Aya Nishitani's Digital Devil Story novels.