It's been four years since they got married. At first, the couple was very happy, but now their relationship has cooled completely... Marina was Kokoro by the discord between her and her husband. At that time, Ozawa, who lived in the same apartment building, would mediate between them whenever they had to... Marina was drawn to his kindness, which did not ask for anything in return. Before they knew it, the two were drawn to each other, and they continued to seek pleasure out of sight of others. However, they could not continue living such guilty days forever...