well , it's not the porn manga.I got vol 1. I think this manga is great one
It's about a girl (but she is a man,really) who came to Kataoka Masato's apartment. Then you can imegin what should happen
it's a comedy and romantic I think.
and I have a cover of vol 1 so you can find it easier
the artist name is Kenjiro Kawatsu and vol 1 released in 2002 if it's not wrong...
I don't know how many vol in Japan now, about 5-6 maybe.
I think you will love it too.