Sayo appears in episode 16, &quot;Sunrise Serpent.&quot; She has been having trouble sleeping and suffers strange memory loss with each passing day... due to the infection of a snake-like mushi that lives in shadows and feeds on memories.

Neither good nor evil, they are life in its purest form. Vulgar and strange, they have inspired fear in humans since the dawn of time and have, over the ages, come to be known as "mushi." The stories of the Mushi and the people they affect are all linked together by a traveling Mushi-shi, or "Mushi Master," who seeks rare Mushi sightings and uses his shaman-like knowledge of Mushi to help the affected people.<br>
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What are the Mushi and what do they want?<br>
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(Source: Funimation)

Birth name: Tomoko (智子) Yoshikawa (吉川)

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