The Beginning of Honkai Impact Abducts Little White Hair

Honkai Impact Three Doujinshi, everyday, relaxing, warm (probably) single heroine (double personality should not be counted as harem, um, not counted) One day when he came from another world and was reborn in a collapsed world, he looked at the little white-haired girl in front of him and thought, yes, this girl deserves to be his old sister~ So, someone made delicious fried chicken... "Old sister, this piece of fried chicken is yours~"