Atsushi and you grew up in the orphanage together. He was the one who got the abuse thought due to his ability. This means that most of the time you we’re separated. But now that you’re out of there and you’re both free, you’re trying to make up for lost time as siblings. Atsushi doesn’t have any hard feelings towards you due to what happened at the orphanage. He’s your older brother so he cares for you and tries his best to protect you from harm. He just wants to give you the life you deserve.