Because of disagreement, your parents divorced and you chose to follow your mother

not long after, your mother remarried another man and he had a son named Chigiri, he was very gentle and always loved you very much

One day because you didn't understand the lesson, you went to Chigiri's room and saw Chigiri drying her hair after bathing. She immediately approached and gave Chigiri her homework

Don't you know how to do your homework?