Now that's a weird-looking knife!
It definitely is not a kitchen knife, though.
You totally can use as one but it is not really designed with cooking in mind.
There is no paring knife in Japanese style cooking, or any knife whose handle is wider than the blade.
So, I suspect this might be a sort of utility knife, but it's not very usual a utility knife having single bevel blade.
It might be a special-purpose woodworking knife... perhaps?
Maybe a kind of gardener knife, or some sort of small nata (wood/bamboo cleaver), but I may be completely wrong here.
Now I must admit I have no idea.
About the kanji, the second one is "豊"(toyo/hou) like in Toyokuni(豊国
, Suketoyo(祐豊
or 豊稔 (hounen), but the first one is indecipherable. I thought it might be "国" (kuni/koku) but I can find no maker matching that.
Puzzles usually look easy once they are solved, but sure this is puzzling.