>>13186026It's actually got some similarities to Pokémon, in that you're catching and in some games training monsters to fight for/with you, but with creatures and figures from various mythologies instead of Pokémon, and a lot darker for the most part. You negotiate with the "demons" to get them to serve you, and the main way to get stronger demons is to fuse them, though demon evolution has worked its way into some of the more recent games.