The tsuchime (hammered) finish that Masashi-san has developed for this line bears a striking resemblance to fish scales, which is where the name of this line comes from. The blade is made from a core of VS1 steel clad in softer stainless steel. Being semi-stainless, the blade edge will blue over time. As long as you dry it in a reasonable time frame you shouldn’t need to worry about rusting.
The kanji on the knife blade “聖作” means “Masashi Saku” or “made by Masashi”