Katte ni Kaizo is his ACTUAL work. Specially what was between tankoubons 10-20.
Before those, the series were just maturing, and after that he had no more interesting ideas for the chapters.

And what is Katte ni Kaizo between tankoubons 10-20? A sociological lobotomy treating themes that usually no one ever care about, but are daily surrounding everyone.

A very subtle and humble dark sociological black comedy that is gonna change the way you see things.