Soon after marrying and giving birth, young wife and university student Nao finds herself juggling motherhood with her studies. Through a university referral, she begins working as a private tutor for Yosioka, a college entrance exam candidate living in the same apartment building. Kind, cheerful, and earnest, yet indecisive by nature, Nao gradually falls under Yosioka's influence. Though he pretends to sympathize with her struggles, Yosioka harbors ulterior motives tied to his exams. Despite desperately resisting due to her commitments to her husband and child, Nao's pent-up sexual frustration following childbirth makes her increasingly vulnerable to the passionate advances of this young student.