Not true. Seek out Double Soft Cream. Same style physics as Umemaro, just different stylistically. Umemaro uses a muted color palette and exaggerated blinns. DSC uses more saturated colors and a normal blinn. But both are great storytellers, modelers, and animators. And they both have a large body of work that has been translated to English.
Here's a link to DSC's circle. If you want it free, I'm sure you can find it on your own, though it is worth the purchase to support the artists and have them make more.http://www.doublesoftcream.net/top.html