The school janitor who initially tries to restrict access to the schoolhouse. He reveals he has guarded the site for sixty years per an oath to Takashi's grandfather. After being attacked and corrupted by Reiko's influence, he commits suicide to prevent further tragedy.
Reiko becomes a direct supernatural threat to Watanabe.
Reiko attacks Watanabe, later corrupts him, and causes him to realize that he is being transformed by her influence.
Watanabe's protective duty is tied to Takashi's family and the supernatural site.
Watanabe explains that he was sworn to guard the schoolhouse after the death of Takashi's grandfather, whose family was connected to the sealed gate.
Watanabe provides essential information that helps the archaeologist confront the supernatural threat.
Watanabe explains the history of the sealed gate, the family treasure, and the danger inside the burial mound to the investigating pair.
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