Hei meets Kenji Sakurai of the Nakazawa Family, a clumsy yet ambitious young man. New characters are introduced who live in Hei's apartment building. Later, Kenji is given the assignment of taking care of a Doll by Hitotsubashi, his boss. Hei, Mao, Yin, and Huang try to find the Doll, who is conveniently in the hands of Kenji.