* Mangaka are both writer and illustrator on single manga, something I see as great skill and effort on the part of the artist.
These are ecchi series, with ecchi think Rated-R in USA movie lingo, which standout far above all other titles in my mind: animanga, ecchi and even hentai, think X to XXX when seeing hentai.
These series center on S&M story-lines between SUGIMARU Kaoru and CHIGUSA Nana, teenage characters of the same grade, during the last couple of years of high school, with very little expose breasts and buttocks. No exposed sexual flesh dealing with the main characters.
Amazume-sensei delivers ecchi titles beyond these, but Nana to Kaoru titles are the best in my humble opinion.
