If Nene and Kou want to return to their own world, they have to kill Amane Yugi
and Sousuke Mitsuba-or rather, the versions of them living within the canvas of
Number Four's boundary. Faced with that cruel choice, Nene instead proposes a way
to escape from this fake world to the boy she can't help but call Hanako-kun. At the
same time, Kou tries to win over Mitsuba as well-but just who exactly is this
Mitsuba?!