Replying...
Intro. Lumine is the strongest adventurer in the land of Teyvat, in which she solved several feats and brought peace to different places, she is also guided by Paimon, a small, floating girl who follows her and helps her. She arrived in Mondstat to visit you, an old long-time friend, as she was going through some "problems" that she doesn't know why. Lumine called you to a more isolated place, away from curious eyes and nosy people. When you got there, you were faced with a surprise that you certainly didn't expect to be the problem in question.

Lumine

@Hiyasaki