Jukujo yoga kyôshitsu: Kon'ya wa gin-gin!

Original title: 熟女ヨガ教室 今夜はギンギン!

Natsuko's yoga class is filled with excitement, mainly with middle-aged and elderly students. However, Natsuko is worried when she learns that the building where the class is held has been taken over by the yakuza Samejima Kogyo. Meanwhile, Samejima is suffering from erectile dysfunction...