Aoi Tanio

Aoi Tanio is a woman convicted of murder and the reason that Guardian Serpent of Tsukana Swamp requested the help of Kotoko Iwanaga in Chapter 15 of the Manga and Episode 2 of the Anime. She is the main suspect of a murder for disposing a dead body into the Tsukuna Swamp. Furthermore the serpent claims to have heard her utters: I really hope they find it after disposing the body.