Tenchi Muyo! War on Geminar

Isekai no Seikishi Monogatari, released in North America as Tenchi Muyo! War on Geminar, is a Japanese OVA series produced by AIC Spirits and BeSTACK, and a spin-off of the Tenchi Muyo! series. The story follows Kenshi Masaki, the younger half-brother of Tenchi Masaki from Tenchi Muyo!, as he is transported to the alternate world of Geminar. In this world, countries wage war using humanoid exoskeletal weapons called Sacred Mechanoids discovered in ancient ruins. Kenshi is initially tricked by a mysterious organization into attempting to assassinate Lashara, the young ruler of the Shtrayu Empire, but is captured when he refuses to kill her. Lashara, recognizing his value, takes him under her protection as her attendant. He travels with Lashara and her bodyguard to the Holy Land, a school for training Sacred Mechanoid pilots. With his kindness, skills in various areas, Kenshi becomes a well-known figure within the academy, catching the attention of many female students. However, the group that deceived Kenshi is working secretly behind the scenes, setting the stage for a world-wide conflict.