When Hideki initially found Chi, his persocom companion, he knew that her original owner might one day come looking for her. Now, that moment Hideki feared has finally come to pass, and what happens is completed unexpected. But even as he is in danger of losing Chi, Hideki makes a new friend when he inherits another laptop persocom. Many questions are answered at last, and even more are posed, in the fourth volume of this international smash hit.