Interest Stacks

Anime adaptations of various gacha games, that is, basically mobile games of various genres (mostly musical or associated with moe anthropomorphism), where you play to earn points that can be spent on getting limited attractive characters (or cards with them) in a virtual analogue of a vending machine. Popularly, these anime are also often referred to as waifu or hasubendo bait shows due to the large number of attractive characters that the adaptation advertises to entice you to download the game.

https://en.wikipedia.org/wiki/Gacha_game