Kono Damedol-domome! Chika Idol wo Budoukan ni Tatasenai to, Gal Shachou ni Boku no Naizou Urarechau!?

Hajime, a shy dog groomer with decent looks but little confidence, has never really stood out. One day, Mahiro, a high school girl he has always treated like a younger sister, suggests he try a dating app to find a girlfriend. Taking her advice, Hajime gives it a try—only to fall into a honey trap and suddenly end up saddled with a massive debt. The only path left for him... is to become a producer for some underground idols!?

(Source: Akita Shoten, translated)