The demons' evil plot requires you to free humanity from their grasp in the game. They grant power and a supernatural appetite for souls to the demon leader in exchange for tormenting humanity and devouring their flesh. The leader is able to resurrect after death by ingesting flesh taken from a live person. The key to humanity's salvation lies in your hands. Your singular duty is to locate and eliminate the evil spirits that plague our world. This requires you to hunt down and eliminate the assassin in your care. By ridding the world of the malignant spirit corrupting it, players improve their hero's power. Because of this, they can combat any enemy and win.

Monsters prey on the souls of humans, born from the darkness. Demons gain power from souls they steal and bulwark themselves by rallying other spirits. They haven’t appeared in dreams since they became born in the world. The more souls they collect, the more powerful they become. People are now at their mercy and can only witness the horror they bring. The Demon Boss ruled his demonic army with a cruel and powerful hand. Before him gathered the souls of his subjects, awaiting the moment they would return to their bodies to regurgitate power.

Because of their evil, mankind has lost faith. You can restore hope by playing the role of a hero who fights back against their every move. You can become Zenitsu and choose five other heroes to help you shoulder the burden. Fight the monsters to destroy them and prevent their continued progress. Doing so prevents souls from being collected for the demon boss. Only advancing through the hallway guarantees a victory for humanity. After each win, continue upgrading your arsenal until you defeat all demon bosses.

In order to cleanse the world of demons, people must mark their mission for humanity. Demons conceal themselves as they wait for people to come forward before attacking them. However, this is not fair; they hide in the shadows and ambush people. Bloodthirsty Demon Bosses always crave power; they pursue defeating you to attain it. From this point, you must stay alive to maintain hope for humanity. You can fight alongside your comrades against the demons in the game. You can compete against other heroes to see who can slay the most monsters. After that, you’ll compete in a demon-killing tournament to find the most powerful demon warrior. Demons pose a significant threat to humanity. They hunt and harvest souls from the living in exchange for power granted to their demon bosses. You are the only one who can resist this threat to human existence. Build a champion from the best of the worst and vanquish evil in the shape of humanity's enemies. Enter the demonic arena to annihilate the bad guys, who will then go down in flames. Downloading the Tanjiro Nezuko Zenitsu Fighting Game mod will allow you to fight for your survival in a contest hall where other demon slayer heroes compete. Called the birthplace of the strongest hero, this location downloads as a separate mod. ———