Board Thread:Questions and Answers/@comment-24975288-20140809171550/@comment-24383490-20140816080449

No, it has been established that Tenchi Muyo! Ryo-Ohki has plenty of parallel 3-dimensional universes. This includes the ones that the Shows "Dual: Parallel Adventure" and "Seikishi Monogatari" and "Photon" respectively take place in.