Kana has been married to her husband, who runs a company, for 10 years. Although their life is fulfilling, Kana feels lonely as her life is far from the marriage she dreamed of. Her husband is not kind to her, and she only supports him. One day, on her way home from shopping, Kana reunites with her old classmate, Oshima. Unlike her husband, Oshima looks at Kana with gentle Hitomi, and Kana's Kokoro is shaken. Kana and Oshima then meet secretly again and again, and as they look into each other's eyes as if to fill the void in Kokoro, they become immersed in deep sexual intercourse, but...