Rerolling is the process of making new accounts, sometimes multiple, to start with lots of great units.
If you have no good units and are below account level 50, you probably should reroll. It doesn't take long at all.
If you are above lv50, have spent money, or have multiple limited units you might be able to keep your account.
The Simple rerolling makes 1 account only, and is guaranteed to work (At least Celeste, Joyce, Erica). Takes about 40 minutes.
The Advanced rerolling makes multiple accounts. It is used when there's a high value event banner worth rerolling for (especially limited combo recruit banners).
If you don't care at all, you can start playing now. Have fun!
The Simple Rerolling involves getting the correct units from Filter Recruit.
To find out more, check out this page >>> LINK
The Advanced Rerolling involves making new guest accounts until you get strong units from a limited banner.
After that, you get the correct units from Filter Recruit. This gives you a very strong start.
To find out more, check out this page >>> LINK
If you want to find a scene that you like and reroll for it, there's a way to do that too.
To find out more, check out this page >>> LINK