Yayoi, a mother who is disgusted with her husband who has been cheating on him so much that he is not at home even on holidays since the beginning of his marriage, pours all of his affection into his son Kota. Kouta, who grew up watching her mother's lonely back, began to think, "I'm the worst father ever!" And Yayoi's heart is moved by her reassuring son's words, "I will protect her mother."
