A surprised daughter, Hiromi, and her husband, Seigo, suddenly visit their mother-in-law, Miki, who has run away from home. That night, Seigo and Miki are enjoying an evening drink alone. Miki, who becomes a kisser when she gets drunk, forgets that she is her daughter's husband, and she can't stand it and sucks on her Seigo's lips. Furthermore, Miki is violently disturbed by pushing down and riding her horse, whether it was accumulated in her daily sexlessness. The next morning, Miki behaves naturally as if she doesn't remember her, but as soon as Seigo, who couldn't stop being excited last night, was alone with her...
