From Update 1.4 the Player can take a break from his adventure to hang-out with some characters to get to know them a bit better.
The first characters added were: Barbara, Noelle, Chongyun, Bennett and each one has different endings depending on the options you pick while talking to them.
With 1.5 update they added Diona and part 2 with Noelle.
DIONA - THE CAT AND THE COCKTAIL
I...ONLY HAD..A LITTLE...
THE UNFATHOMABLE FELINES
THE ULTIMATE SPECIAL
NOELLE - KNIGHTLY EXAM PREP
REST AMIDST THE ROCKS
THE MAID-KNIGHT'S TALE
THE ONE AND ONLY NOELLE
WORK MADE FOR A MAID