Shin Megami Tensei

In Tokyo 199X, a mysterious murder leads to the emergence of demons and an escalating global conflict with the rise of a charismatic rebel leader in possession of a demon army, and external forces that wish to crush such threats with extreme measures.

You, the protagonist, have an unusual ability enabled by a computer program that lets you communicate with and recruit demons to your side. As you collect demons, the program will allow you to store, summon, and fuse them to create the right team to negotiate the ever-changing balance of powers, and fight for the kind of world you ultimately wish to live in.