Kanure Stella operates under multiple identities: publicly revered as Saint Mama, head of the Stella Church, while secretly commanding the Sorcerer Hunters as their leader, Big Mama. She co-founded this group with Sacher Torte to protect non-magical Parsoners from oppressive sorcerers across the Spooner Continent.

Big Mama commands the primary Sorcerer Hunter team—Carrot Glace, Marron Glace, Gateau Mocha, Chocolate Misu, and Tira Misu—dispatching missions via her assistant Dotta (also called Daughter). She maintains a protective, guiding role, offering crucial strategy and support.

Her core conflict pits her against the sorcerer Zaha Torte, who seeks to destroy and rebuild the world. This hidden cosmic struggle frames the narrative, with the Sorcerer Hunters initially unaware they are pawns. Big Mama must intervene to stop Zaha's plan to exploit Carrot Glace's latent connection to the God of Destruction and prevent global catastrophe.

In the manga, Big Mama and her elite Haz Knights, led by Millefeuille, ultimately sacrifice themselves to thwart Zaha's ambitions. Lore reveals Big Mama, like all Sorcerer Hunters, is a reincarnation of a deceased deity, placing her actions within a divine framework central to the overarching conflict.