My favourite anime game is Konosuba: Fantastic Days because it indroduced me to Konosuba and made me love everything related to it. It's also the first anime game that I've ever downloaded.
Of course, this game isn't perfect because the combat system, even if it's simple, can be a little repetitive in the long term. The gacha system is a bit unfair, but in the end if you play a lot you can earn a good amount of gems to use in the summons and get the featured characters you want.
The best part, though, is the main story (adapted from the anime) and also the events' stories which are always updated and never boring.
If you like gacha-based games and good plots, this game is for you.