The city we'll visit is called "knife city Sakai," known for its knives from about 450 years ago, and still their skills are alive and improving. However, not many people don't know about how the professionals work for one knife together and their history. Even sharpening knives are not familiar with people. We'd like to share the wonderful Sakai knives with you, and how to sharpen them. Let us make your trip to Japan a bit more interesting and fascinating.