Seconding the Masashi Kokuen (although I believe it’s SLD). It’s not quite as light as Kotetsu but still the lightest and thinnest knife I currently own. Incredibly nimble and just a pleasure to use. When I first got it, I thought it might be too delicate but after a few uses I got comfortable and it’s become my go-to for any small-ish jobs — slicing one chicken breast, caprese salad, dicing an onion, etc. Super well made, looks badass and no durability issues in a home setting. IMO bunka is the right size for a light knife like Kokuen. Petty and gyuto I prefer slightly more robust.