Sorry guys, found a few more sites:
Haikyo - The Abandoned and Ruins of Japan
Great Escapes - Haikyo - Ruins in Japan
Haikyo / Ruins
This one is more of a blog:
Haikyo: exploring abandoned Japan | Japan Pulse
Look at the 4th paragraph: “Lately a bunch of [not very nice people] have even documented how they break in. They break glass and steal stuff,” he explained. “And they use the fire extinguishers. It’s depressing to find a place which was practically untouched for 30 years, only to find traces of some English teacher’s recent visit all over the place.”
To my other post from a while back, being a teacher should also mean they have some level of social responsibilities, stealing and breaking in is the last thing I'd expect from a teacher..... of course, I don't know how they know it was some English teacher's handy work...