.hack
Epitaph (1x9)
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A girl meets Tsukasa and tells him that she will be out of town for a little while and that she would like him to help take care of her Grunty. While taking care of the Grunty it eventually becomes sick and the only cure is a hard to find purple cherry.
While Tsukasa is searching for the cherry all the other characters are discussing the Key of the Twilight. Sora mentions that he may know someone that might be able to help them in their search...the great hacker Helba.