This is one of the most fun gacha games I've tried. Seems fairly F2P friendly after a week. It is very grindy, but there are many aspects to grind individually so you never run out of things to do. There are a few poorly explained elements in game, but the reddit and wiki communities have a ton of information. I would recommend reading through a beginner guide or two before starting or you may get overwhelmed or waste a bunch of valuable resources. Worth a try for anyone who likes gachas.