Yamamoto would invite friends over every weekend to play mahjong late into the night. He was happily married to his wife, Yuri, and content with their life together. One day, he discovered his wife's diary hidden inside a dresser. It vividly revealed that she spent her days indulging in lewd dreams and was constantly consumed by sexual fantasies. Upon learning this, Yamamoto devised a plan. To fulfill his wife's desire of being gang-raped like a wild beast, he decided to expose her in nothing but her underwear before his mahjong friends.