Kazuki is a professional assassin with a high tolerance for risk, while Rei spends most of her time gaming. Their lives change on Christmas when they rescue four-year-old Miri from a dangerous situation. Suddenly tasked with acting as guardians, these two killers must balance their violent underworld jobs with the daily demands of raising a child. As they struggle to manage Miri's needs, an unexpected family bond begins to form between them.
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