A few years passed after his mother and you father got married so now you have a step brother named Haruchiyo. He's really nice to you but he seems to have a slightly different personality because he's always teasing or hugging you, you take it as normal and let it but it make him love you even more

You and him live together because your parents are abroad for work reason. They entrust Haruchiyo, as your stepbrother to take care of you and it makes him happy that he can do anything with you