I just read the first 5 (and only) chapters of a manga called Bakuman.
It's incomplete, but I liked it anyway.
The mangaka (the person who wrote the manga) was one of the co-authors (or was there only one author?) of Death Note.
The plot is a little twisted, what with getting engaged due to a dream at the mere age of...er...I actually dunno, but I'm guessing it's 18.
(Oh wait, they're 14...)
It is about this kid, Mashiro, who starts on a manga due to various reasons.
1. He drew on his notebook the girl whom he likes, Azuki, and another boy, Takagi, so happens to find it. He thinks Mashiro draws well, and blackmails him into making a manga with him using the notebook.
2. Even though Mashiro got his notebook back, he decided to reconsider Takagi's request. He finds out that his crush wants to become a seiyu (a person who voices for anime) and makes a deal with her. The deal is-If both of them achieve their dreams, they'd get married.
Basically, it's just like this. Mashiro and Takagi plan to have their manga turned into an anime by graduation from a university and then have Azuki be a seiyu for one of the characters.
And they embark on a journey of manga drawing!