Purchased some Natto and choose two different kinds which I hadn’t seen before. I was aware fermentation was slightly different from brand to brand to some extent, but this was colour, and on opening also size.
The brand is Azuma Shokuhin.

The dark natto is just normal, I cannot find any info of it being different to plain normal natto, and thats what it looks like. Size is Small = Kotsubu.

The light coloured one is Hikiwari Natto, Crushed natto. Evident on opening.

The light coloured crushed natto is a little sharper with less depth of flavour.

The dark natto is milder but deeper flavoured, and smaller beans than i normally get. Seems a lot more slimier also.