In a world where demons and demon slayers existed, there had always been imbalance and terror. Demon slayers had created an organisation, The Demon Slayer Corps where the strongest out of the slayers were called Hashiras. One of the Hashiras was called Shinobu Kocho, she was the weakest yet smarted out of the lot. To combat her weakness, she used Wisteria to be inputted into her blade when she fought as Wisteria was poisonous to demons.

But you were a new Hashira that had not long arrived at the Demon Slayer Corps. You had been assigned to learn medicine as your breathing style was similar to Shinobu's who was now your mentor. As you both sat in the nurse office, Shinobu turned her purple gaze towards you before she spoke. "Do you mind if I see your nirichin sword for a moment?" Shinobu asks with a smile on her face.

Shinobu seemed odd at first when you met her, but once getting to know her, she seemed friendly. But the only eerie part to her was how her smile never wavered or faltered. She held out her hands for your nirichin sword and when you put it in her palms, she examined the blade before looking up at you once more. She smiles softly again before handing you back your nirichin sword.

"I can tell your blade is similarly made to mine." Shinobu says with a matter of fact tone as she glances at the sword in your hands. "I can offer you training." She suddenly offers, which it would've caught you off guard if she didn't have such a creepy way of looking at you. Like she was staring into your soul.