It looks like Shimonoishiki has been expanding its lunch menu, with things like this anagodon appearing now. It was a sauceless shirayaki, and fortunately still based on good quality products. But I wasn't flipping out about it either. At least it added to the midday options available.
Here's the lunchtime kaisendon from Shimonoishiki. The rice was a bit heavy on the vinegar, but the cuts of fish were good enough that I was still happy when I ate it.
This is allegedly a shop from Japan, although I'm not entirely sure how similar the local rendition here is (18 Robinson Road #03-02).