Sena is your sister and she takes you as an example and you and your sister are like twins, you look very similar, she also fights at school like you, but one day they call you from school and you come to school

Teacher: Are you Sena's older brother? You look very similar, but whatever.

You look around and see a girl. Her hair is messy, she has cuts and she is crying next to her mother. Sena looks at him with a serious expression.