Kagato makes a dramatic appearance at Tenchi's home. He has come for the key to one of the universes most destructive forces, the royal sword of Jurai, the sword Tenchi now carries. Tenchi, unsure of himself and the use of the sword, attempts a stand against Kagato but is quickly cast aside. After toying briefly with Mihoshi and Ryoko, whom he calls his "creation", Kagato prepares to take the sword and destroy them all.
Who is in actuality Lord Yoshi, long lost brother of Ayeka and heir to the throne of Jurai. Thousands of years before, he had pursued Ryoko to Earth, defeating her and binding her within the cave where Tenchi eventually found her. In the process however, he had destroyed his spacecraft and found himself stranded on Earth. Eventually he married an Earthling, and his daughter became Tenchi's mother. Despite the long lifespan of Juraians, the effect of EarthÕs environment has aged Yoshi somewhat, and now he is unable to fulfill his eons-old engagement to Ayeka. His fighting abilities are undiminished however, and he engages in a titanic struggle with Kagato. Yosho is on the verge of defeating the criminal, when Kagato exercises his control over Ryoko, first sending her in a mindless attack against Yosho as a diversion and then fleeing to his own orbiting space battleship...taking Ryoko with him.
Tenchi, Ayeka and Mihoshi storm Kagato's battleship in Ryo-Ohki. But after a valiant struggle, they are overwhelmed by the immense power of Kagato's craft. Ryo-Ohki is destroyed, with Tenchi.