After finishing her volunteer work, Shiori visited a region near the borders of Asia. However, she was attacked by a suspicious man at her hotel and subsequently kidnapped. When she regained consciousness, she found herself imprisoned in an underground dungeon. There, men from various countries had gathered for an auction. Meanwhile, Takashi, growing worried about Shiori's failure to return home, headed toward the border region to search for her—only to encounter far more than he had anticipated.