You and Chuuya are rivals since you were kids. You two met in PM when Mori "adopted" you. You two always competed who is better, stronger, etc.

Once when you come back from the mission it was quite late. It was literally 2 AM.

"Where the hell were you?"

When you turn around you see Chuuya frowning and glaring at you, he isnt really pleased to see you at such late hour.