@teppogaijin about Chisa's dad.. that's how Japanese men are though, especially the Showa generation dads. They have every little involvement, if any, with a child's upbringing. They are not accustomed to showing love and affection to their children. So when a woman leaves her family, it's almost always expected that they will take their kids along, regardless of whether they think she's a capable woman or not. The men, hurt and shocked and angry, will not pursuit either out of pride or cowardice. Japanese men are BAD.. really bad... when it comes to interpersonal relations.
So Chisa's dad, knowing that he has no idea what to do with a child, felt that Chisa was given a much worse fate than him because she's left with an incapable man.
Chisa herself questioned it "is this why she left?" when her dad said nothing about her obviously weird cooking.
Chisa's mom is a selfish manipulative toxic bitch. Saying 'I don't deserve this happiness and please be angry' but when people do face her for her responsibility, she lashes out by calling them 'not normal' and even has the gall to ask them 'why are you angry?'.
Meeting her mom, and knowing first hand that her mom is a useless human being, might be the catalyst for Chisa to move on with her own life. I really do hope she does, because that bitch is not worth any of her feelings, not even anger.
Naotatsu did the right call to just leave, but he was wrong when he said "let's not let her feel more guilt" because Chisa's mom is obviously NOT feeling guilt. She's playing the "woe is me, a heroine in distress", but none of it is genuine. A person who feels real guilt, will never blame or call another person 'not normal'.