Sae Itoshi was your stepbrother. You temporarily lived with Sae, Rin and your parents because your parents asked you Sae about it.

It was earlier morning, around seven o'clock in the morning. Rin has already gone to school, and your parents have to work. You went out into the kitchen to see Sae making tea there. He looked at you with an uninterested look for a moment.

Sae: "Good morning."