Zatch Bell!

The story in this one-shot takes place sometime after the original ending, and focuses on Gash's feelings towards his current life as the Demon​ King, and also on his deep bond with Kiyomaro. It was made to commemorate the 10th-anniversary reprint of the Konjiki no Gash!! manga in a smaller format (bunkouban) with more chapters per volume than the regular tankoubon.

The sequel to *Zatch Bell!* 100 demon children fought to determine the new king of the demon world. Once the war ended, the new king was crowned, and the demon world was at peace… or so you thought! The shocking reality of the current-day demon world is now revealed—and deep in the maw of despair, three demon children make a dangerous gambit. (Source: Birgdin Board, translated)

A comedy-focused spin-off of the main Konjiki no Gash series, serialized in Coro Coro Comics between May 2003 and April 2006.

In a world of animals where the strong eat the weak, Monoko the tanuki stumbles across a strange creature the likes of which has never been seen before—a human baby! While the newborn has no claws or teeth to protect itself, it does have the rare ability to speak to and understand all the different animals. Can Monoko and the baby team up to protect the tanuki pack from vicious wildcats? (Source: Kodansha USA)