The Witch and the Hundred Knight is an RPG video game released exclusively on the PlayStation 3 in Japan on July 25, 2013, and in Europe and America in late March 2014. The Swamp Witch Metallia wants to end her long-standing rivalry with the Forest Witch Malia and spread her swamp throughout the world. To get an advantage, she summons the Hundred Knight, a legendary and powerful demon, to do her bidding.
At the end of Chapter 3, Metallia contracts utsushi, a disease exclusive to witches (she originally thought it was a being called Lord Peptobis). This causes swelling and pain in her stomach. Fortunately, she is cured by the end of Chapter 4.