Handsome high school student Akemi is a computer genius. One day a new girl, Yumiko, transfers to his class from another school. She quickly falls in love with Akemi but, absorbed in his computers, he pays her no attention at all.

The reason for his absorption is the monster he has created with those same computers. Digital Devil has become his own evil genie., and Akemi summons this devil after school and sets it to work wreaking revenge on his enemies.

Source: www.jamesanime.ch/digitaldevil.html

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Alternative setting: Shin Megami Tensei: Tokyo Mokushiroku