This knives called [yanagiba]. this is made of steel, so it is easy to be rusted and cannot miss everyday care.
However, it is sharp very well!
The picture above is my kitchen knife. And my father's kitchen knife is below. as you can see, my father's knife is looks changed because of he used this more than 30 years. He also sharpend everyday.
My Father went to heaven eight years ago but This knife is an treasure reminding of father'work.