Very good.
Usually, stories about “coming of age” starts off slow, then paces really fast at the end. This is no exception.
I came, like everyone else, for the interesting description (“Masturbation? What?”), but I’m glad I did. The start is slow, and a little bit odd, but the plot progress very quickly, which I liked. Also, the character development in Onani is great! I feel like anymore than 31 chapters, then the story won’t be as great.
9/10