

Highly recommended are:
Harakiri - A short (and relatively clean, for guro) manga about suicide and the Japanese obsession with fads. My personal favorite.
Annnddd......
Super Conductive Brains - A longer treat with organic mechs, body modification and little people! It may not be ero-guro, which is nice really, but it is still grotesque. It was a several chapter serial that I believe was originally published for a shonen magazine. Some kind of weird ass shonen magazine I guess.
If you like him, why not look him up sometime? He's got some pretty cute toys that he makes as well as short films. Fall in love with Kago's character's cute faces, his unique style of comic writing and err.... quirky(?) sense of humor.