Spoiler: Summary from MangaUpdates
showIt's not easy to become and live as a mangaka, as Moritaka Mashiro knows from his late uncle, the mangaka Taro Kawaguchi.
At 9th grade, while trying to keep up with reality, school and then a normal job, he left his notebook with a sketch of Miho Azuki, a girl he likes. Akito Takagi, a first-rate student found it and tries to convince Mashiro to draw a manga with his story. Mashiro doesn't like the idea and declines.
Takagi, however, sticks to his dream and found out that Azuki wants to be a voice actress and has already gotten a good reply from a production company. Takagi then brought Mashiro to her house and told her his dream... Mashiro then tells her that he will write a manga with Takagi and will ask Azuki to voice their anime.
Under the pen-name, Muto Ashirogi, Moritaka sets out to become the world's best shonen manga artist!