It's about this girl who is secretly a famous smut/ecchi writer or something on a magazine. She gets discovered by this famous guy (i think he's a piano player or something?) and he falls in love with her.
The title of the manga has the number 18 in it i think. so it's like: "Blank" 18 or something like that.
i don't remember too much ( im sorry!) but i hope you know what I'm talking about >.< thank you very much.
