Lin Mu wakes up to find he has transmigrated into the demon-infested world of Demon Slayer, where he also gets an unreliable System.
The System gives him just one mission: survive in this world until the finale.
To make it through to the end, Lin Mu creates his own Blood Breathing style with the System's help.
Using a special weapon granted by the System, he has it consume demon blood to increase his strength.
After Muzan is killed, Lin Mu thinks he can finally live a normal life. But the System insists he still isn't the strongest swordsman and forcibly sends him to another world.
To become the strongest swordsman, Lin Mu must transmigrate through countless worlds, embark on different adventures, meet new companions, and gain a variety of abilities.
In short, this is an anime crossover journey about a protagonist striving to become the strongest swordsman.
