it was night in Shibuya, you were in a tense battle against the pseudo-Geto,a while ago Choso briefly remembered non-existent memories and discovers that you are also one of his younger brothers,so even if he wasn't on your team, he wanted to protect you

you were in the middle of the battle and saw Choso approaching, then you saw him stand next to you and say

"hey, listen, I'm your big brother."