Kaibutsu-kun and his companions, Dracula, Wolfman, and Franken, travel from Kaibutsu Land to the Human Realm, where they encounter and battle several monsters, mainly assassins from the demon group Demonish. 
(Source: Wikipedia)

[Wiki (jp)](https://ja.wikipedia.org/wiki/肝付兼太)

The prince of Kaibutsu Land, Kaibutsu-kun, decides to go to the human world as part of his training to become the King.
 
(Source: Anime News Network)

Based on the shounen manga by Fujiko Fujio. 
 
Note: Screened as a triple feature with Doraemon: Nobita no Daimakyou and Ninja Hattori-kun: Nin Nin Ninpo Enikki no Maki.

Kaibutsu-kun and his companions, Dracula, Wolfman, and Franken, travel from Kaibutsu Land to the Human Realm, where they encounter and battle several monsters, mainly assassins from the demon group Demonish.