Kanna Utsugi is a Tower Witch and the member of the Ivory Quintet―KMM Gang.
She is transferred with other members of KMM Gang after the second loss of Tanpopo Kuraishi to Honoka Takamiya's class. She is a underling of Medusa. Later, it was hinted that the five of KMM Gang, including her, be the allies of Workshop Witches by protecting Honoka allying with Ayaka.
(Source: Witchcraft Works Fandom)
