Tatsuro, the son, was fond of his mother Sayuri, who runs a knitting class. His mother smiled gently and knitted with smooth hands. However, Tatsuro was not happy that his friend was learning knitting from his mother. One day, when Tatsuro went to pick up his mother, who had gone to teach knitting at a friend's house, he saw the two of them playing around in an abnormal pose. Unable to suppress his jealousy of his friend and his desire for his mother, Tatsuro disguised himself as his friend and embraced his mother from behind...