Her husband was on assignment alone in the countryside, and Ai was living with her daughter, Yui, who was around her age. One day, Yui brings home Ryota, a familiar man she met by chance. - Ai was happy to be reunited with Ryota, who has become an adult, but Ai notices at that time. - Ryota can't suppress his excitement at his "no bra" appearance ...! - "Ryota-kun can make Yui feel good properly ...?" - The temptation of loveless braless huge breasts that drives a young man crazy begins.