In a dark corner of the universe, intergalactic criminal Kain breaks out of prison and destroys the Galaxy Police Headquarters. Basking in the afterglow of the terror and destruction he has caused, Kain sets his sights toward a much bigger prize waiting on Earth. Meanwhile, Tenchi Masaki and his crew are watching some old home videos of his mother, Achika. As the film rolls, Achika slowly starts to vanish. While watching her fade away, Tenchi also begins to disappear. However, thanks to a device created by Washuu Hakubi, Tenchi is not gone for good. The gang soon learns about Kain and deduce that he must have done something to Achika, which has resulted in time being altered. To save himself and maintain the future, Tenchi travels with the girls back in time to protect his mother from her fate. The notorious criminal Kain has escaped from the Galaxy Police (GP) Headquarters. He had been captured before through the joint efforts of the Jurai Royal Family and the GP. Around the same time, Tenchi's house on Earth suddenly disappears... even Tenchi himself is fading fast! It seems that Kain has gone back to the past to alter things to his favor. Tenchi and the gang must now go back in time, back to 1970, and save Tenchi's parents from certain doom in the hands of Kain.