In the Tenchi Universe continuity, Achika Masaki is the mother of Tenchi Masaki.  Her parents are Katsuhito and Itsuki Masaki.    Achika plays a major role in Tenchi in Love.  The Tenchi gang travel back in time to save Achika from the extradimensional being Kain.    Tragically, Achika dies when Tenchi is young.  While we are not shown these events, episode 9 (No Need for Memories) shows some flashbacks to scenes following her death.    Achika should not be confused with Kiyone Masaki, Tenchi's mother in the OVA series.

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. <br><br>
(Source: Anime News Network)

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Received a BA in English from Princeton University, and an MFA from the American Conservatory Theater. Studied voice under Catherine Fitzmaurice and Nancy Houfek. Received certification as an Associate Teacher of Fitzmaurice Voicework in 1998. Has taught actors and business speakers in New York since 1984.    (source: Internet Movie Database)