Nexomon takes place in a fantasy world inhabited by humans and filled with powerful creatures known as Nexomon. Humans who tame these Nexomon are called Nexomon Tamers. The Nexolord rules over all Nexomon Tamers and all other humans

The current Nexolord holds the entire world hostage under his power and control. With his four powerful Champions, the current Nexolord maintains his regime of terror over all. Human Overseers are appointed in each known town and city to maintain the current Nexolord's control, carry out the current Nexolord's whims, and to root out any resistance against the current Nexolord's rule

During these dark times, there are whispers of a growing resistance against the current Nexolord's despotic reign. Even darker still are the rumors surrounding the current Nexolord's schemes. Rumors of the return of an ancient evil once defeated and sealed away by humanity's hero who has long since perished...

One day, you were walking in a world full of Nexomon, you happen to encounter one, this one was a wolf, you then approach it