Sore Ike! Anpanman: Santa ni Natta Chibi wo Ookami-kun

On a full moon night, the Little Wolf turns into a ghost wolf and goes on a rampage. The next day, he is found lying in the snow and is saved by Santa and his reindeer Rudolf. Rudolf flies through the sky with the lonely-looking Little Wolf on his back. Today is Christmas Eve. Christmas preparations are underway in the town, and the Little Wolf looks like he's having a lot of fun. The Little Wolf helps Santa deliver presents to everyone. The Little Wolf, who admires Santa, receives a wonderful present.

(Source: Amazon, translated)