Extra episode included on the 6th BD/DVD volume.
The episode is from Baabu's point of view as he describes life as a zombie. Rea attends her first day of school as a zombie, where her zombie strength helps her out. Meanwhile, Baabu takes an interest in another female cat, but chooses to stop their relationship when he draws close to a confused state, and a scientist who studies zombies arrives to Japan to see what new samples she will find.
(Source: Wikipedia)
