There is no such thing as orgcore. Seriously, can people stop inventing genres and sticking core on the end? It's very silly. The bands mentioned on that site seem to be mostly pop-punk and a lot of them are on Snuffy Smile, definitely the best Japanese pop-punk label. The Urchin, Screaming Fat Rat, Spraypaint, Minority Blues Band and the aforementioned Pear of The West are all worth a look. I recommend the compilation Pig Dog records put out a few years back as a starting point, 'The Best Punk Rock In Japan Tomodachi' compiled by Yoichi Eimori (the guy that runs Snuffy Smile). Then again I don't know if Pig Dog still exists, it was run by Russell Remains and might have died around the same time as the Fracture zine did... Anyway, yeah, Snuffy Smile are great. I'll try and remember to put some Pear of The West or something in the sendspace thread.
Edit: Pig Dog seems to have indeed died a long time ago so I bet 'The Best Punk Rock In Japan Tomodachi' will be really hard to find, I should rip it for the sendspace thread since it's really excellent and has the amazing My Winter Jane on it, and I'm pretty sure all their records are oop too..