Tesso

is a rat demon who frames Kuroro as an evil demon while disguised as human. He poses as a faith healer in Kuroro's village and drives her from the village, claiming that the twin tail "invites calamity". After doing so, he unleashes a massive hoard of demon rats onto the village and has them devour everything in their path so that he might grow more powerful.

Later, he is killed by Inuyasha, who realizes the giant Tesso he is fighting is an illusion and destroys the real Tesso, hiding inside a rock, with Wind Scar.

Tesso 铁鼠