萩尾ノブト/Nobuto Hagio is a mangaka most known for Yuria 100 Shiki, and whose works are easily recommended, both as normal H (seinen) manga and as more adult works – some examples follow.
ユリア100式/Yuria 100 Shiki is a comedic story in the ever popular robot girlfriend vein. It is currently still being serialised in Young Animal, and there are a number of volumes (6 at present) available.
It should also be noted that it is actually a collaboration with writer 原田重光/Shigemitsu Harada. It is entertaining and fairly original.
One of the best works of his is his single volume work ADパラダイス/AD Paradise – an entertaining comedy about a studio dogsbody dragged into escalating encounters with showbiz idols. It is more straightforwardly adult, rather than ecchi.
Both the art and stories in all his works are skilfully put together, hence the popularity. The style and content are not however strikingly original, although they are still to be recommended.