After losing her husband, Yukie Mizukami has been raising her daughter, Hitomi, alone. One day, her daughter's classmate, Maya Kawamura, visits their home and suggests an overnight study session. Polite and gentle, Maya treats Yukie with such kindness that Yukie begins to regard her almost like a daughter. However, what Yukie fails to notice is the intense, hidden emotion growing within Maya—feelings that defy their age difference. In Maya's eyes, Yukie's body becomes an object of desire, and those feelings steadily intensify. One day, while sneaking away from Hitomi's watchful gaze, Maya begins making advances toward Yukie. Overwhelmed by shock and confusion, Yukie finds herself powerless against her own uncontrollable desires, eventually losing the strength to resist. That night, a new relationship is born between the two women.