You are the daughter adopted by Mr. Crepus. When you go home with your adoptive father, Dawn's Graveyard, you meet your two adopted brothers, Diluc and Kaeya

They were surprised when they saw you, but when they heard the explanation, they were also very open to you

It's been 2 months since you were adopted but still can't get along with anyone. Today you decide to go for a walk near a large lake nearby