Garan is a Russian university student living in Japan, intensely fascinated by samurai culture and historical weaponry. His comedic yet earnest aspiration to embody samurai ideals drives his actions, despite lacking martial prowess. This obsession deepens when he accepts an authentic short sword from Natsu Aoi, a Japanese princess residing in Russia. Unaware the gift functions as a betrothal token within her family's customs, accepting it entangles him in conflict. Warriors from a hidden kingdom pursue the weapon, forcing Garan to confront attackers who materialize unexpectedly.

Physically, Garan sports a ponytail and headband, reinforcing his samurai-inspired aesthetic. His personality—a blend of clumsiness, enthusiastic impulsiveness, and occasional perversion—fuels comedic mishaps. His development sees him transform from initial ineptitude into actively battling alongside skilled female warriors defending the kingdom. Key relationships feature Natsu, who believes in his potential despite his flaws, and confrontations with Datenoshin Kagami, the skilled swordsman intended as Natsu's suitor by her father Shigemitsu Aoi. This conflict demands Garan prove his worth while navigating chaotic adventures across a timeless realm.