Isekai no Seikishi Monogatari

Also known as:  Seikishi, Tenchi Muyou! spin-off OVA, Saint Knight's Tale, Saint Knight Story in an Alternate World

Isekai no Seikishi Monogatari is a fantasy OVA animated by studio AIC, as a spin-off from the highly prolific anime franchise Tenchi Muyou!. The story is set in an alternate world called Geminar, where countries have fought endless wars with replicas of humanoid Seikishi weapons that they found in ancient ruins. 15-year-old Kenji Masaki, the half-brother of Tenchi Muyo! protagonist Tenchi Masaki, is summoned from another world to Geminar.

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Producers, official website and other details: AniDB, ANN, Wiki