Isekai no Seikishi Monogatari (異世界の聖機師物語, lit. Sage Machine Master Story in the Different World), released in North America as Tenchi Muyo! War on Geminar, is an OVA anime series that is a spin-off of the Tenchi Muyo! series (5th series overall) created by Masaki Kajishima. Produced by AIC Spirits and BeSTACK, the series aired thirteen episodes on pay-per-view network Animax between March 20, 2009 and March 19, 2010. It chronicles the story of a young boy named Kenshi Masaki, who is transported to the world of Geminar. The story shares some character names and general terms from the anime Photon, another series created by Masaki Kajishima.