You can find it on Gobanboshi's website:
HereSimply click on Simcity on the right, then →日本型建築スタイル保管所 under ●kei様提供プラグイン and then it's the first file →日本小物基本セット1 - ver1.05(2015年4月16日)
The other links under it are the others dependencies from Kei, and then you have almost all buildings created by Kei.