Sailor makes a number of store-exclusive inks for shops in Japan. The inks available fro, the Kobe Nagasawa shop is practically a line of inks all on it's own. Current up to 62 inks as of this writing. They are perhaps the easiest of the store exclusive inks to obtain, especially at reasonable prices. They can be found at Vanness Pen Shop online store, as well as Nagasawa's own page on Amazon. You can also get them through cool-japan on ebay.
This particular color doesn't seem to get much interest. I bought a sample while ordering some other inks. The name also appears as Minatojima Island Blue.
There's some reviews from a few years back that complain of excessively long dry times with this ink. I didn't experience that to be true, but the nib, while quite wet, was a fine. Perhaps it would be an issue with wider nibs.
The ink is fairly saturated, but not to the level of say Kobe #14 Maya lapis, which is often used as a point of comparison with this ink. This doesn't have as much red in it as that ink either, and it seems to have a bit more gray in it's value, it's not as bright blue as #14. There's some definite shading, some pink sheen that amazingly sometimes even appears on the absorbent paper such as MvL (which never shows sheen). It's a strong looking, professional blue. Depending on the paper, I don't think the dry times are that bad for papers such as Rhodia, Tomoe River. The ink is not water-resistant, it tends to spread to the back side of the paper and run, so don't count on saving any writing in such cases.
There are many blue inks in this line, over 27%, and they all vary in saturation, and relative degree of red vs green in their hue, it may well benefit the potential buyer to get some samples of inks they think they'll like. That way they can give an ink a reasonable test before an actual purchase. While a few of the most popular inks go out-of-stock on occasion, they are usually readily available.
Pen: Edison Mina (F-steel)
Papers: MvL=Mohawk via Linen, TR=Tomoe River, Rhodia=Rhodia 90g ivory.
Camera: iPhone 7