The Gacha Games genre has had a long journey from the casual gacha vending machines that you can find all across Japan, where you would put in coins in order to get surprise toys in small containers, and you would never know what you would get. This is a system made popular in that country which was then adapted into video games as well, with now there being a whole subgenre of them, that have only become more popular over the years. Some notable examples include:
The system of these games is that you would use in-game currency earned by performing tasks, completing mini-games, winning battles, and accomplishing other kinds of achievements, but there is also the possibility of buying various packs, loot boxes, and other items directly from the developer's website using real money. You pull or spin in order to get characters or items, similar to slot machine games, and there are quick-time events when you can get some special items too.
Players sometimes spin many times before they get a good reward, which is often considered a pity because the game assigns it to you for having been unlucky so much time. In many of these entries, you have original characters to win, usually, anime girls, who are the most popular, but sometimes they have crossover with big brands of anime series where you earn characters from those shows to use in battles or various competitions.
We have to say that the format and genre have drawn criticism and controversy all over the world, as some consider it to be akin to gambling and quite addictive, which is why we recommend only playing these games as much as you feel comfortable with them, but stick around to always catch the newest one since you don't know when a new one drops, so you should get ready to pull or spin the best characters ever!