Mai Hanai is a 21-year-old university exchange student of Southeast Asian descent, currently living in Hawaii with her divorced mother, Amelia Hanai. She presents herself as sweet and modest to the outside world. Beneath this chaste exterior, however, Mai is highly sexual, kinky, and frequently experiences intense carnal desire.

Because her mother, Amelia, is characterized by an incredibly strict and traditional nature, she acts as the primary source of the rigid rules that Mai so often seeks to rebel against.