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 in time to alter things to his favour. Tenchi and the gang must now go back to the year 1970, and save Tenchi's parents from certain doom at the hands of Kain.

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Sequel: Tenchi Muyou! in Love 2 - Haruka Naru Omoi
Prequel: Tenchi Muyou!