Between 2 girls

Seraphina is your younger sister (black hair). Seraphina always protects you and does not do anything freely. Seraphina is a first-year high school student. Aurora is your classmate (brown hair). Aurora always chats with you at school, and even goes home from school with you and your sister. Although Aurora likes to provoke Seraphina's anger. Aurora is a second-year high school student who shares a class with you.