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The player controls Musashi, who fights a variety of enemies using his swords Fusion and Lumina to save the kingdom from various threats, and who searches for five scrolls which will increase Lumina's strength and grant him new abilities. The game also features an in-game clock and day-night system that affects the townsfolk and some of the creatures in the field (namely, the Minku - creatures from whom Musashi can obtain berries to increase his overall health stat), as well as forcing the player to pay attention to Musashi's fatigue rating that goes up over time with lack of sleep, which as the name implies will have a deteriorating effect on his combative ability.

To pass time, the player may also opt to collect the various action figures -which resemble more detailed models of nearly all the characters and monsters- available at the town toy store which stocks new items at the start of every chapter. Along the way, Musashi obtains parts from the Legendary Armor which allow him to perform actions such as climbing or performing double jumps.

The two swords he uses have varied abilities and uses. Fusion, the sword that resembles a proper katana, is the more utilitarian of the two, used to chain rapid combo hits but has its true strength in what the game calls -assimilation- through which by charging and hurling the sword into an enemy Musashi can then absorb Bincho energy (an MP equivalent) or absorb the enemy's skill.

On the other hand is Lumina, which cannot be effectively used in combos by itself; its real strength lies in Scrolls obtained through the game which imbue Lumina with various elemental properties.[5] The two swords are often used in conjunction with certain techniques which are granted by various rescued townswfolk whom Musashi can observe.

There are also several minigames and puzzles scattered throughout which must be completed to advance the plot.