The core theme is the contrast between the sanctity of the mother figure and the vulgarity of the delinquent. The narrative tension is derived from watching the "untouchable" become accessible and eventually corrupted.
The antagonist is a "furyou" (a delinquent or thug). This character serves as a foil to the protagonist; where the protagonist might be meek, respectful, or powerless, the delinquent is aggressive, dominant, and morally bankrupt. The plot usually kicks off when the delinquent discovers a weakness—be it financial debt, a secret, or simply the mother's desire to protect her child—and exploits it to blackmail the mother. furyou ni hamerarete jusei suru kyonyuu okaasan