Otto, I'm Not Your Son

Protagonist: Aika Kaslana (transmigrator)

Father: Otto; Mother: Kallen

Picked up by Theresa and brought to Schicksal, she lives with the Siegfred family before the Second Honkai Eruption and trains under Fu Hua to fight the Honkai.

(A friendly warning: If you have a low tolerance for toxic content, please don't read.)