Mary is seen at the start of the series winning a poker match against Ryota Suzui, who ends up owing her a debt of 5 million yet. Unable to pay it, Suzui instead becomes her pet in the end, and she treats him in an inhuman manner, such as commanding Suzui to bring her food and using him as a footstool when she says that her legs are worn out. When Yumeko Jabami transfers into their class, Mary is instantly jealous of her popularity and her getting close to Ryota. She pretends to challenge her... Yumeko is excited about the election and Mary tries to warn her about the Momobami Clan and how they are probably dangerous. She also states that all of their names end with "-bami", just like Yumeko's. But Yumeko doesn't listen, which Mary expected. Mary later bumps into the Vice-president in the hallway. Ririka wants to gamblewith Mary and tells her to follow her. She explains to Mary how she wants to join forces with her. Mary doesn't want to, because she believes Ririka just follows Kirar...
