A prequel of Digimon World where you play as Jijimon and you build up File City.

It could be something less about training monsters and more like Animal Crossing, where you have relations with different Digimons and they can evolve and give different bonuses to the city depending of your actions. RPG elements would be good but probably not really needed, it could also be a very light game, so maybe a phone version? Ok this is just a game i would like, no one will ever need something like this.