Demon Slayer: The Cold-Hearted Oni Lord Wants to Kill Muzan

(Demon Slayer) (Female protagonist: Kanae) (The pacing is a little rushed at first, but it gets better later) (Everyone survives) Guess what?

A new writer's first book.

Yan: Muzan Kibutsuji, your greatest defeat was that the demon you created with your own hands that night destroyed the happy life I should have had.

Muzan Kibutsuji: YAMETE!