Demon Slayer: Kimetsu no Yaiba

After finding his family slaughtered, a boy rushes down the mountain with his sister and discovers that she has turned into a demon.

Tanjiro heads for Mt. Sagiri with his sister Nezuko, who is now a demon. During the night, Tanjiro smells blood coming from inside a temple and goes to investigate.

Tanjiro trains rigorously on the mountainside with seasoned Demon Slayer Sakonji Urokodaki only to meet his most challenging task a year later: splitting the world's strongest boulder in two using nothing but his sword.

It's Tanjiro's first and final selection, and he's being stalked by a morphed demon whose scent reeks of its previous victims; this isn't the kind of class reunion Tanjiro was expecting.

When day breaks, Tanjiro and the other survivors are welcomed into the Demon Slayer Corps and issued uniforms and Kasugai Crows as messengers. Then they must select the ore for their very own Nichirin swords.

Tanjiro receives his first assignment for the Demon Slayer Corps and heads to a town in the northwest where girls are vanishing nightly. There, he meets Kazumi, haggard with worry after his girlfriend's abduction.