That masaki look. Yuu may have misinterpreted it.
He had no reason the be there
Over the chapters we seen this new Yoshito guy, the author made him say over and over the reason he fights, and what he left on the streets.
This was a fight of purpose, which yuu lacked, rather didn't find completely, actually.
The way this volume ends is the best possible, shin is reassuring him, in a way.
It isn't over.
Yuu will find his reason