Affection

Affection can be checked by clicking on the 'Momo talk' smartphone icon on your home screen. This stat can be raised by tapping on them on your dorms, giving them gifts while they are in your dorms or select them on the schedule.

Raising the Affection stat will give the character small bonuses to their stats and unlock their Live2D background for your homescreen after reaching a certain milestone. Here is the table of when each Live2D CG is unlocked.