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One of the subplots tearing the family apart is that Dai's teacher calls Mamoru in to talk about his son's misbehavior and Mamoru starts dating her. So it's not just the mother who is seeking a partner outside the marriage, as suggested by the current edit.
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One of the subplots tearing the family apart is that Dai's teacher calls Mamoru in to talk about his son's misbehavior and Mamoru starts dating her. So it's not just the mother who is seeking a partner outside the marriage, as suggested by the current edit.