Ikemen Douryou ga Ore no Juukakin Fan deshita

Unbeknownst to those around him, Shirafuji is a game streamer who goes by "Shirocho" online. At work, he hides his love for games and "camouflages" himself as a nice young man. He also finds it hard to deal with his naturally exuberant and handsome co-worker, Meguro. However, he discovers that Meguro is actually his hardcore top donor fan who has been constantly donating hefty amounts during his streams...?!

(Source: Frontier Works, translated)