Nioh is an action role-playing video game developed by Team Ninja for the PlayStation 4. It was released worldwide in February 2017, and was published by Koei Tecmo in Japan and Sony Interactive Entertainment internationally. Gameplay revolves around navigating levels and defeating monsters that have infested an area. Nioh takes place in the early 1600s during a fictionalized version of the Sengoku period, when Japan was in the midst of civil war prior to the ascension of the Tokugawa shogunate. A sailor named William, in pursuit of an enemy, arrives in Japan and is enlisted by Hattori Masanari, servant to Tokugawa Ieyasu, in defeating yōkai that are flourishing in the chaos of war.