One day, much to their surprise, Ascoeur and Q-feuille find themselves assigned an actual mission: to babysit a special little girl named Di-air. Things go smoothly at first as the two get to know Di-air and become her friend, and they show her around GTO headquarters and take her outside to play. The problems begin when, while outside, the three are approached by the hostile duo Rubis and Saphir who are from the same group as the assassins from before...