This is an especially sharp Japanese knife, using white-2 steel from Yasuki, which is reputed to be the top grade of steel for knives.
This knife is made by Takao Shibano who is one of the most famous craft-man.
Also it is a daring trad design which seems Japanese greens are called warabi.
Kiridashi kuri kogatana Takao Shibano woodworking Knife white-2 steel warabi hand forged 60mm