The girl you're describing has a kind nature and deeply loves her family. Despite having had a traumatic experience with bullies, particularly one classmate from primary school, she has remained loyal and tolerant for the sake of her loved ones. Her affection towards another classmate named Saeki Ryou is rooted in his consistent kindness to her. However, their relationship may soon change as she discovers that he was actually the bully who tormented her at school. The girl's father passed away when she was young and after four years of relocating, she returns home when her mother decides to remarry. Unfortunately, she is unaware that her new step-brother is none other than the very person who had bullied her in school.