Honkai Impact 3rd: The Light Bringer

Shiroi Kaslana is the adopted Son from Siegfried Kaslana and the Big Brother from Kiana Kaslana.
He was the child of Sigurd Kaslana, his father, and Ayuki, his mother. His father died in the second Honkai eruption. As for his mother, Shiroi never knew her, as his father raised him alone with the help of other people, such as his little brother Siegfried and his sister-in-law Cecilia.

Shiroi follows in his father Sigurd Kaslana's footsteps and becomes a knight who protects everything he loves.

Not everything makes sense that's why my fanfiction card make everything sense xD