Working as a private tutor, Miku Aoki meets Saki Hatsumi, a married woman seeking to learn English. With her husband rarely at home, Saki's marital affection has faded, and she gradually finds herself drawn to Miku's warmth. At the end of a lesson, unable to contain her feelings any longer, Saki pins Miku down and confesses her love. Though initially hesitant, Miku accepts Saki's emotions, and the two passionately fill the voids in their hearts—eagerly sharing double-ended dildo play, strapon penetration, and intense lesbian intimacy. However, a new development soon emerges to challenge their growing relationship.