Demon Slayer: I Died in Battle from the Start, Then Mastered Forbidden Arts Through Reincarnation

I had just joined the Demon Slayer Corps when a Lower Rank demon killed me in one hit.

On the brink of death, I awakened the [Memories of Reincarnation System]!

[Ding! You have died. Would you like to spend Reincarnation Points to permanently preserve one ability or item you had before this death?]

"Preserve it! Lock in Total Concentration: Constant!"

[Congratulations, Host! Your physique has been permanently enhanced! Training efficiency +300%!]

Die once more, and your teammates can be sacrificed to make you invincible!

"Preserve it! Lock in the material of this 'Maple-Dyed Iron' Nichirin Blade!"

[Congratulations, Host! You have obtained a one-of-a-kind divine-grade material!]

The forbidden art, Blood-Burning Technique, will damage my meridians? No problem. I can reset by dying!

The forbidden art, Heart Slash, requires me to blow myself up? Great, I can blow myself up endlessly!

Shinobu Kocho: "Lord Fengming, your talent for toxins... it's almost inhuman." (blushing)

Kyojuro Rengoku: "Young man! Why is your understanding of the Breathing Style deeper than that of all my ancestors?!"

When I stood before Muzan Kibutsuji, holding the Banner of a Hundred Demons, clad in a divine body formed from incense offerings, and standing atop countless ghosts...

Muzan Kibutsuji: "??? You're not human at all. You're a god!"