Niten Ichi-ryū is a traditional Japanese martial art founded by the famous swordsman Miyamoto Musashi in the early 17th century. It emphasizes the use of two swords simultaneously, typically a long sword (katana) and a short sword (wakizashi). The style focuses on fluid movements, timing, and strategy, allowing practitioners to adapt to various combat situations. The name "Niten Ichi-ryū" translates to "Two Heavens as One," reflecting Musashi's philosophy of harmonizing the two swords. Today, this martial art is practiced worldwide, preserving Musashi's techniques and teachings through dedicated schools and practitioners.