What is there to say? Cute waifus, fun gameplay, so many summons for free, skip tickets, easy to get into. This game is really good for both the casual and hardcore. Levelling is easy, raising equipment doesn't take forever nor do you have to farm for different equips. Stages are super generous with drops, especially if you can do the harder stages later. You get so much stuff just given to you in this game, you pretty much don't need to spend a dime.