Makoto's Mother works as a nurse, balancing her career with family care. She exhibits compassion and dedication professionally, embodying values of hard work and perseverance that she imparts to her children. Her reserved nature aligns with an ISTJ personality type, marked by conventional beliefs, logical choices, and a strict duty to uphold household order.

Before her son Makoto's suicide attempt, she secretly engaged in an affair with her flamenco instructor. Makoto discovered this when he saw her leaving a love hotel with the instructor, an event contributing to his subsequent suicide attempt. After Makoto's recovery and return home, she harbors profound guilt but masks her anguish to protect the family's fragile peace. She persistently tries to reconnect with Makoto through domestic gestures like cooking meals and buying items for him, though he meets her efforts with hostility after learning of the infidelity.

Her Enneagram Type 2w1 traits drive her to support others while seeking validation, manifesting as attempts to sustain familial harmony amid emotional tension. Unresolved guilt and fear of exposure escalate as Makoto rejects her openly, triggering visible emotional instability—such as silent weeping during meals or carelessly spilling gasoline while distracted. Her husband later indirectly supports her during a fishing trip with Makoto, advising him to "give her a break," but the narrative shows no direct reconciliation between mother and son. Her motivations for the affair remain unexamined, and her storyline concludes without explicit resolution despite her critical impact on the family dynamics.