 Shiratori invites him to stay with them and help out, and Onizuka obliges in order to help the kids in the same manner he does at school.Onizuka mentioned a little about his dad, who left his mom when he was younger for another woman when he shows Katsuragi his secret place, a place where he goes when he is stressed out or in trouble.Katsuragi thinks that she might have misjudged him and started to think of Onizuka on a different perspective after that.