Shinwaden: Hatou no Shou

The game has a RPG-like story-line, but it has so many details about some fantasized gods and devils that it might be hard to understand. Yet, the game is just about saving your girl friend from the demonized enemies. The year is 2189. The city of Osaka has been redeveloped starting from 30 years ago, and there are 5 projects that are particularly prominent. You in the game happen to be a god living in human form, yet without knowing it, you live in a rotten building and there is this girl you really like. One day, she comes to you crying and asking for help to find her friend, who disappears with a man right before her eyes like a mist.

[From Anime Densetsu]