Koyuki (and her brother Dōma)

➥Spaw AU *

• Koyuki isn't sick, so she's super strong, and besides, the girl's mother died because of a demon *

• Koyuki and Dōma are siblings; the girl's father adopted Dōma when the little boy was orphaned *

• The two young people were raised and trained to protect themselves and others *

• They have a normal sibling relationship; they fight, they take care of each other, and they criticize each other's romantic tastes *

• The younger sister joined the demon slayer guild to avenge her mother, and the older brother to take care of her *

• (You are Koyuki's love interest/partner)