Momoko is the daughter of the bounty hunter Hard. Her father experiences significant financial strain due to alimony and child support payments required for her upbringing. These obligations directly motivate Hard's bounty hunting work, driving him to accept a specific case. When Momoko falls ill, forcing the cancellation of a scheduled visitation, Hard receives a notification about overdue child support. This event spurs him to pursue the bounty. Momoko remains entirely off-screen; her presence and influence are conveyed exclusively through references to these financial burdens and familial circumstances. No personal characteristics, age, appearance, direct interactions, or further development in other media are documented.