A boy named Jin discovers his Uncle Nabu using magic to spread chaos across the kingdom, turning everyone, including his brother Zeke, into animals.

Learning from the king's court magician, Mysticat, about a way to return everyone to normal, Jin goes on a quest to recover five animal orbs from across the kingdom.

Upon doing so, however, Mysticat takes the orbs from Jin and uses them to open the gateway to the Dark Realm for his master Lord Xaros, who had been manipulating Nabu to do his bidding.

Venturing into the Dark Realm, Jin confronts Xaros and, with the help of his friends and the spirits of past Wonder Boys, manages to defeat him, restoring the kingdom to normal.

Monster Boy and the Cursed Kingdom is a side-scrolling adventure game in which players control Jin as he battles enemies and solves puzzles to progress through the story.

In addition to these forms, players can obtain weapons and armor from shops, many of which offer unique abilities and can be upgraded by finding gemstones.

Exploration often rewards players with magic upgrades, health point increases and also pieces of the legendary golden armor, which upon collected can be forged by a blacksmith.

After a year of silence, Game Atelier revealed that they had partnered with LAT Corp to officially incorporate the title into the Wonder Boy series.

The game's soundtrack was composed by Yuzo Koshiro, Motoi Sakuraba, Michiru Yamane, Keiki Kobayashi, and Takeshi Yanagawa, with the main theme performed by Haruka Shimotsuki.