A mysterious boy arrives in town seemingly out of nowhere. Unbeknownst to Lum and Ataru, this boy is their son from the year 2045, and he has traveled back in time to save his hapless perverted father from his evil shapeshifting stalker with the help of his mom.

5 years after the trans-America wild race. Appare Sorano has built a giant cannon that can transport people to the moon. And he invites all his friends to come along on the adventure. But when they get there, they discover that their actually people living there, and all is not what it seems.

Being wolf demons in feudal Japan, Ginta and Hakkaku had never even heard about Christmas. But once Kagome explains it to them, they become enchanted with the holiday and convince her to throw a Christmas party for all their friends. As the day of the party draws near, Ginta and Hakkaku decide to travel through the bone-eaters well to the modern era to find extra special presents.