Once upon a time, Kazuyuki, Fumio, and Sara taught at a rural school. Although there was talk of being assigned to Tokyo, Kazuyuki was worried about his father's health and hesitated. Fumio took his place instead. Thus, Kazuyuki, who was spared the assignment, married Sara... Since then, Kazuyuki had become estranged from Fumio, but when he contacted him after a long time, he learned that Fumio had retired due to poor health. Such was Fumio, invited to Kazuyuki's home. Taking advantage of Kazuyuki's absence, Fumio made advances towards Sara. Someone who had once been indebted to him. Sara couldn't strongly refuse...
