Incest that feels so good after a mother-son fight

After losing her husband, Eiko has raised her son, Hiroshi, on her own. Eiko loved Hiroshi, who could not be described as cool, but was very honest and healthy. However, Hiroshi has only one drawback... That means "I'm weak in the morning." One day, Hiroshi overslept on an important day even though Eiko woke him up. The two end up having a big fight over this. After several days of not speaking, Hiroshi realizes how grateful he is to Eiko.