Urakata de Support Shiteta Geinou Ikka wo Tsuihou Sareta Boku wa, Futsuu no Seishun wo Ouka Shitai.

Disowned by his elite celebrity family for being "useless," Atsumu spent his youth in his sisters’ shadow—unbeknownst to everyone, he was the hidden genius behind their success all along! Now free from his family’s control, he’s swept into the entertainment world, catching the eye of top idols, models, and Vtubers who all recognize his true talent. But as he rises through the ranks—and finds himself surrounded by beautiful admirers—can this former backstage prodigy handle the spotlight AND live a normal high school life?!

(Source: Manga UP! Global)