Look up the work of August Ragone.
These guys are also pretty great.
http://www.monsterattackteam.com/store.html
They focus a bit more on Godzilla, but they love Ultraman as well. The quality of the newest issue is way higher than the others, but they're all fun reads. Plenty of Kamen Rider in there.
Also, thanks to them, I got to see Tak Sakaguchi fight a man like ten feet in front of me. Before bowing and thanking us, in English, for coming to see his movie. Never gonna forget that.