Tenchi Muyo! War on Geminar
異世界の聖機師物語 (original)
From the creators of Tenchi Muyo! Young Kenshi Masaki suddenly finds himself transported to the world of Geminar where he's caught between a beautiful princess, a violent civil war, and a hoard of gorgeous girls who are dying to get their hands on him!
Starring Hiro Shimono, Natsuko Kuwatani, Momoko Saito, Junko Noda, Madoka Yonezawa, Rie Nakagawa, Ayumi Tsunematsu, Mai Gotou
It's a animation and action & adventure show, and has a rating of 7 out of 10 from Imdb which is usually fine for this kind of show.
Watch it here
Not found streaming from United Kingdom.