Chiyozuru Korehide (1874-1957) was born into a family of swordsmiths. After the Edict Abolishing Swords in the Meiji era, he trained as a carpenter's tool smith and gained an unshakeable reputation thanks to the enthusiastic praise of carpenters who actually used his tools. Korehide, who had been deeply impressed by his master's user-oriented philosophy during his apprenticeship, created works that were the epitome of functional beauty. Among these, a group of design kiridashi knives stand out as unique. These kiridashi knives, with their free and flowing designs, are difficult to use from a practical standpoint, existing at the very edge of what constitutes a tool. They possess exceptional sharpness but are not intended for use, representing a non-utilitarian beauty. Despite his fame as a tool smith, why did Korehide create beautiful design kiridashi knives that sacrificed practicality? The author, who runs a carpenter's tool store spanning three generations with his grandfather and father, has long been acquainted with Chiyozuru Korehide's works. Using valuable stories and materials passed down from his father, Ichiro Tsuchida, who was directly taught by Korehide, the author meticulously traces the footsteps of artists, cultural figures, and craftsmen around Korehide, including his interactions with Fumio Asakura, unraveling the mystery of his stylistic changes within the larger context of the times. He does so as if in deep dialogue with chisels, planes, and kiridashi knives, conveying the richness of blacksmithing culture.