My friend's mother, no bra shame

His son, Kenji, who had just transferred to schools, brought a friend. Her mother, Miki, greeted her with a smile, but that day, the bra that she was supposed to be drying out runs out, and her friend Satoru becomes suspicious. When Manabu, the leader of the class, finds out that Satoru was suspected, plots revenge on the Matsuzaka parent and child. When Manabu went to stay at Kenji's house, he attacked Miki on the night sky and photographed her breasts exposed to lewdness. Using the photo, Manabu and Satoru force Miki to do no bra and invite her friends to play with her young desires...