Onepunch-man isn't gruesome and 'lacks' fanservice. But well, it's a fun series nonetheless, so it's worth your time.
I wonder if anyone has 'tasted' Oku's next project so far? called "Yume Onna".
The first chapter seems interesting: bizarre things happen to people when they sleep. There are mature contents of course.
Thanks I didn't know about Inu Yashiki. The two mangas seem interesting but I find it hard to wait for a new chapter every two or three weeks. sucks to follow a manga from the begining