Muramasa: The Demon Blade is an action role-playing game developed by Vanillaware for the Wii, and later the PlayStation Vita. The game was published in 2009 by Marvelous Entertainment (Japan), Ignition Entertainment (North America), and Rising Star Games (Europe). The Vita version was published in 2013 by Marvelous AQL in Japan and Aksys Games in Western territories. Using a 2D side-scrolling perspective, the gameplay revolves around a beat 'em up fighting system, while incorporating role-playing elements such as leveling and questing.

Muramasa takes place during the Edo period on Japan's main island of Honshu. Due to ruling shōgun Tokugawa Tsunayoshi's thirst for power, conflicts have arisen over ownership of the Demon Blades, samurai swords that force their wielders to kill others before bringing tragedy and madness upon them. The story revolves around two different protagonists related to this conflict — Momohime, a woman who is possessed by the spirit of vengeful rōnin Jinkuro Izuna; and Kisuke, an amnesiac ninja on the run for a forgotten crime who is tied up with the tragedy that destroyed Momohime's family. The Vita port includes four self-contained stories based on Japanese folklore released under the banner title Genroku Legends.