Two TV series ( Tenchi Universe and Tenchi in Tokyo), both of which contain independent alternate continuities that share many of the same characters.
This lone act begins a cascade of events that results in Tenchi moving from Kurashiki to the Okayama countryside, acquiring a half-dozen alien girls in an Unwanted Harem, discovering his own secret heritage, and becoming involved in events of literally cosmic proportions. When Tenchi steals the keys to - and intrudes upon - a sealed cave on the shrine grounds that legends say holds a sleeping demon, he accidentally releases Ryoko ( Ai Orikasa), a Space Pirate who had lain in suspended animation for seven centuries. The OVA series Tenchi Muyo! Ryo-Ohki (simply Tenchi Muyo! in the United States) follows the life of Tenchi Masaki (voiced by Masami Kikuchi), the teenage grandson of a Shinto priest (who has taken it upon himself to teach Tenchi an ancient form of swordplay).