Taeko, who lost her husband, currently lives with her eldest son, his wife, and his grandson.One day, the eldest son and his wife decided to spend a week on a trip to Hawaii, and they began living together with their university student grandson.I didn't realize it at first, but I found a sex toy in her grandson's room and it was a big deal!Taeko, who has a lot of fun with toys despite her age, and her grandson who sees it and gets lustful.This is a forbidden love affair between a mature woman and her grandson.