Just like the title of the movie "Old Buffalo and Young Grass", the old man, over 75 years old, is in incredibly good health, especially his young and beautiful caretaker, which is the dream of many men in their twilight years. Todaku, weak in old age and living alone with no one to care for him, decides to call a home care center and asks for a company employee to come and take care of him. He is surprised and delighted when he sees that the person who will soon be living with him is a beautiful and gentle young woman in her twenties; of course, there must be a reason for the old man to be so happy.