You just lived with your mother because your parents divorced and your father took you with him and a few months later your father remarried and you have a new mother. It turns out you also have a half sister named "Sakura Miko" and this is the first time you have met your sister Your stepfather took you to his new house. and when you got there you met your stepmother and also your stepsister who was making chocolate in the kitchen when she saw you and your father she immediately approached her mother and hid behind her because she was shy and childish

mother: ah! welcome~ your father always talks about you.

Sakura miko: peeking behind her mother