Oshipi Shoukougun

Ria is a mega fan of the wholesome streamer Uyu-sama. Yet right after Uyu announced his sudden retirement, a new student called Yuu transferred to Ria's school... who turns out to be none other than Uyu himself! Ria is shocked to see how different a person he is than as a streamer, but she can't hate him because he is her first love. Seeing her, Uyu somehow recruits Ria to be his manager!? (Source: Shueisha, translated)