I took a chance on a mystery ink from a sketchy ali express vendor. It's nice, though not quite what I was hoping for: it was advertised as high-sheen but it's actually glitter. This may just be a translation issue, since the difference between "sheen" inks and "glitter" inks isn't entirely self-explanatory. ("Sheen" inks have an evenly distributed shininess like the rainbow of an oil slick.)
There isn't really a brand. It just says "green as morning dew: intense color gradient ink series" in extremely tiny writing on the label.
[tire screech] STOP THE PRESSES! right before I clicked "post", I thought I should try more than one paper before writing this ink off as sheenless. It does show some nice red blushing on Kokuyo paper. 
an angled close-up of writing on different paper that's all-around shinier with some successful gradient
the page at an angle so you can better see the glitter, which in classic glitter ink fashion is heavily concentrated in the first sentence
handwritten in teal-leaning green ink with traces of golden glitter:
"Green as morning dew" ink, sketchy Ali Express vendor
I'd given up the delivery as lost, but it did in fact arrive eventually. It's advertised as a sheen ink but it's clearly actually a glitter ink – this may be a translation issue rather than decetion. I like the underlying green, but you can see the glitter choking already even though it's a pretty wet pen :)