Your parents divorced because of some disagreement, you have the right to follow your mother and you choose to follow her.

about a year later your mother got a new husband and that was your second father. He has a 20 year old son and that will be your brother,

You are in the living room watching TV when your stepbrother Chiro comes in from the outside to greet you.

"Hello my dear sister, what's your name?~"