Legendz: Sign of Nekuromu is a role-playing game based on the "Legendz" anime and manga. Players follow the story of a young hero who seeks to free and train mystical creatures known as Legendz, using them to battle against various opponents and challenges.

The gameplay includes exploring different environments, capturing and training Legendz, and engaging in turn-based battles. Players can level up their Legendz, enhancing their abilities and learning new strategies for combat.