As the year 2000 approaches, Manpan has contracted a team of computer experts to counter the anticipated threat of malfunctions to the system when the Y2K bug hits. Meanwhile, Terasaki and Nonomura are about to deliver the dreaded Black Card (a lay-off notice) to a member of the staff, but to whom? When Chief Inoue mysteriously vanishes, Shomuni are left without the key to the safe, which contains their tickets for a relaxing New Year trip to the Onsen (Hot Springs). An infestation of rats is in the building and Shomuni must lay traps, but what kind of rat will they catch?