Ichika has been married for three years, but her overworked husband is only home long enough for them to see each other morning and night. Meanwhile, she is struggling to help a student named Yamamoto return to school. After three months of fruitless home visits, she grows close to the boy's equally troubled father, Takeo. When Ichika discovers her husband's affair, Takeo is the first person she calls. He rushes over out of concern, and her pent-up feelings spill over as she kisses him, leading them into a forbidden affair at school.