Demon Slayer: I Master a New Breathing Style Every Day and Become Invincible

Mu Bai transmigrates into a world where Demon Slayer has merged with other universes and joins the Demon Slayer Corps.

Every day, swinging his sword once grants him one of the most powerful Breathing Styles.

From the start, he obtains Water Breathing: Ultimate Form: Heaven and Sea Reversed!

He accepts a mission to save Tanjiro, a new member of the Demon Slayer Corps.

At Mount Natagumo, he decapitates the Lower Rank demon Rui with a single slash.

Day Two: One sword swing grants him Boundary Breathing: Ultimate Form: Boundary-Destroying Zero Slash!

Day Three: Life Breathing: Ultimate Form: Reincarnation!

Indestructible Diamond Body, Time Reversal...

From then on, Mu Bai is invincible. On the Mugen Train, he slays Upper Rank Akaza with one slash and uses Reincarnation to revive the Flame Hashira, Kyojuro!

While hunting down Muzan, he destroys the Infinity Castle with a single blow!

Muzan: My Infinity Castle is gone?

Special Grade Cursed Spirit: You can cut through a Domain with one slash?

Shinobu Kocho: Mu Bai, let's have a baby~

Nezuko: Munch~ munch~ Tasty~

The Rinnegan, the Three Types of Haki, Domain Expansion, and abilities from every crossover universe: Mu Bai has mastered them all to the highest level!

Thirty days later, one hundred crossover universes merge!

Countless characters invade!

With one slash, Mu Bai splits the continent in two, and the whole world...

This novel and its characters are entirely fictional. Any resemblance is purely coincidental. Do not imitate.