Sonota-kun

(from ebookjapan):

Sonota Kimiwa, the son of a taiyaki shop owner in downtown Tokyo, is a self-proclaimed manga enthusiast. While his classmates are thinking about their future as they prepare for high school entrance exams, Sonota decides to become a mangaka!

However, Sonota, who has always been a bit of a dope in every way, is unable to get his friends or his parents to recognize his dream. Determined, Sonota goes to see Osamu Tezuka, the master mangaka, for advice, but what happens?