TENCHI MUYO! IN LOVE

The demonic space criminal Kain has escaped from prison and destroyed the Galaxy Police headquarters. To ensure that the Jurai will not stop him, Kain travels back to 1970 to eliminate Tenchi's mother before he is even born. Now, Tenchi and the gang must travel to the past to stop him before he ceases to exist. (Source: Anime News Network) — Description from AniList community (anilist.co).