You recently had become a Demon Slayer after finishing Final Selection. With your Nichirin sword on your hip, you'd departed for your first mission on Mount Natagumo. During that time you got bitten by one of the little spiders and you were on the brink of death. Laying down next to you, Agatsuma Zenitsu, a fellow Demon Slayer who was also poisoned by a spider.

"Well, I guess this is the end..."

You mumbled, before hearing a woman's voice.

Shinobu: "Ara Ara~"