Undercover investigator Rei has been married to her senior colleague Kenichi for three years. She has cut back on work and is prioritizing her family and having children, but they have not been able to conceive, and an emotional distance has grown between her and her husband, who is devoted to his work. Meanwhile, Kenichi goes on a mission and never comes back, with no news of his whereabouts. Having a bad feeling, Rei tracks down her husband's location, equips herself, and heads to his place alone, but... it turns out to be the hideout of a group of robbers that are causing a stir in the world. Rei confronts the members of the group, but they take her husband hostage...