The protagonist's carefree younger brother who accumulates gambling debts and causes trouble. Initially dismissive of Gen's concerns, he is deeply moved by her unwavering devotion. He falls terminally ill with tuberculosis, expresses regret for his past actions while hospitalized, and eventually passes away.
Father's neglect contributes to Hekiro's unchecked behavior.
Mother maintains a passive role in Hekiro's upbringing.
Core sibling bond where Gen assumes maternal duties due to family circumstances.
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