Hi there. I'm the owner/admin over at Uboachan and I'm also running this backup site on the same hardware.
On April 15th, Itamae told IRC he would be going into the mountains to go fishing for the weekend and would be without internet. We never heard from him again. Then on May 14th, the sushichan server went down. We sent a letter to his known address almost two weeks ago but have heard no reply.
So, for the past little while, me and Undoall and a couple other users with backups of site data have been working on throwing this bunker together. It's not quite finished yet but I hope it can bring everyone together again.
There's also a snapshot of the site from just a little while before it went down, at http://archive.sushigirl.us/