Nao, who moved to Tokyo after enrolling in college, becomes close with Misa, a married woman living on the floor below. However, Misa is bisexual and takes a liking to Nao, gradually making increasingly aggressive advances toward her. Initially hesitant and confused, Nao finds herself drawn into an erotic relationship with another woman, slowly awakening to the pleasures of lesbian intimacy and becoming captivated by its allure. Enchanted by Misa's warmth and the depth of their sexual connection, Nao eventually begins reevaluating her own sexuality.