The plot of the Corruption of Champions centers on the player character, who is unexpectedly transported to the demon realm of Mareth to rescue their kidnapped sister, Kai. The protagonist must navigate this strange world filled with various demon clans, monsters, and corrupt influences, fighting for survival and uncovering secrets while attempting to find and save Kai.
Throughout the journey, the player faces choices that influence their physical and moral corruption, transforming the character's body and mind. The story includes alliances, battles, and interactions with many unique characters, balancing between resisting the corrupting forces or succumbing to them, which ultimately affects the ending and the character's fate. This mix of dark fantasy and adult themes drives the plot's unfolding in this demon-infested realm.
