About the Shape - A Nakiri is a vegetable knife. Under utilized in the Western kitchen, the Nakiri’s flat blade is meant for the push/pull chopping of vegetables. Since the entire flat edge of the knife kisses the cutting board at once, you wont be turning the vegetable into an accordion. Accordion vegetables are still connected like a paper doll after you're 'done' cutting them. To truly understand the awesomeness of a Nakiri we recommend making onion soup your first night with the knife. The ease of chopping will blow you away.
About Masutani - Masutani san is owned by a brother of Ryusen Hamono. Masutani san decided to produce knives that are great quality but at reasonable prices. His knives are incredible for how much they are.