Demon Slayer: To Stay Alive, I’m Relentlessly Wearing Muzan Down

[Demon Slayer] [Spartan Education] [Raising a Brother-Con] [Beating Muzan to a Pulp] [System]

After transmigrating as Tsukihiko Ubuyashiki, things were at hell difficulty from the start.

His twin younger brother was Muzan Kibutsuji, and the future god of death Yoriichi Tsugikuni was on his way.

Luckily, the [Strongest Tutor System] had arrived!

As long as he tormented... ahem, educated his younger brother, he could grow stronger!

[Ding! Force Muzan to do one thousand squats under the midday sun. Reward: Nichirin Iron Prosthetic Limb (imbued with sunlight)]

[Ding! Beat up disobedient Muzan. Reward: Perfect Biological Cell x1]

[Ding! Teach Muzan calculus and Das Kapital. Reward: Clue to the Blue Spider Lily]

And so, the most terrifying legend of the Heian era was born.

Muzan cried out, “Big brother, I really can't eat any more! This Wisteria tea is so bitter!”

Tsukihiko (coldly): “Drink it. This is to make you immune to poison. Your big brother only wants what's best for you.”

Hundreds of years later, Yoriichi Tsugikuni drew his sword, only to find Muzan covered in high-tech armor and wielding heavy firearms.

Muzan: “See the gear my brother gave me? Sun Breathing? Times have changed!”

The System panel flashed wildly: [Host has raised an ultimate life-form. Lifespan +9999!]