Ougon no Ringo

Ryuuji is not your average high school student. With the family business struggling, and the atmosphere at home growing tense, he doesn't have time or the money for leisure—he's too busy with part-time work. So of course, when a talent scout offers him a place in the dog-eat-dog world of the entertainment industry, he turns him down. Except this talent scout is surprisingly persistent...

(Source: Shoujo Sense)