Though married, he was never popular with women and has become a typical middle-aged man, a humble figure coldly treated by society and his wife. He goes through the motions of work, earns a decent living, and returns each day to a home where he is not welcome. Into this gray life appears a beautiful woman, Koyoi Konan. Working with this capable colleague on a client project has been his only recent joy, but as the project nears its end, their relationship begins. Overwhelming maternal affection, the ultimate devoted woman, skilled lovemaking, and unmatched beautiful big breasts. From a gray world into a rosy adulterous life.