Haruna was the Juraian lover of Yosho.  After Yosho defeated Kagato, he and Haruna left for Earth.    Haruna died right after she and Yosho reached Earth.  Yosho buried Haruna next to her Juraian tree, a camellia.    In rememberance of Haruna, Yosho planted camellia trees everywhere he traveled using the seeds for Haruna's camellia.    Half a century later, Haruna's camellia bloomed for its last time, awakening Haruna's spirit.  Haruna called out to Tenchi and pulled him into an alternate world powered by Tenchi's Juraian power.    Yosho kills Haruna's tree, causing her to remember the past.  Yosho came to her world one last time, to see her and remind her of her past.

Tenchi walks into the mountains and disappears. After searching all over Japan for Tenchi, Ayeka and Ryoko finally locate him in Tokyo where he is now several years older. Tenchi appears to be in a parallel world with a mysterious girl, named Haruna, and doesn't remember Ayeka and Ryoko! What is the mysterious connection between Haruna and Tenchi's grandfather, Yosho? It's up to Ayeka and Ryoko to discover what Haruna wants with Tenchi and to rescue him before he disappears forever!<br>
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(Source: Geneon Entertainment)

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Mother of voice actress [Honoka Inoue](https://anilist.co/staff/129363/Honoka-Inoue). She has held a long-running gag of being 'eternally 17 years old'.