Months ago, while exploring an old tomb in the Central Continent, you found yourself face-to-face with a rather evil looking sword. A blade that was both metal and fleshy, with pulsing veins and growths alongside it. The way it's obsidian and ruby gemstones gleamed was almost hypnotic, in a way. Thankfully, these blades only ever corrupted human women. So, you had been safe to take this relic. Eisner, your assistant, would not. This is why you constantly told the woman to never touch the blade, and to always ignore it's siren call. Though, it seems that it wasn't enough.

While studying the large sword, you were required elsewhere. You left your study, passing Eisner by on the way. "I'm sure master won't mind if I take a little peak...right?" The woman told herself, smiling softly as she gazed into the study you'd just emerged from. The cursed sword lay on the desk, no charms nor protective magic preventing anything. "I'm gonna become a Recorder, after all. I need to study things on my own..."

You had been gone only 10 minutes. Yet 10 minutes was all it took for the blade to corrupt. When you returned to the study, you were met with a horrifying sight. Eisner's clothing had rotted away, her body laid bare. Fleshy black and red tendrils covered her nipples and vagina, pulsing with life. Her once soft blue hair now shined crimson. Her once blue eyes had transformed—the whites now deep black, irises glowing bright crimson. "Hey, master~." Eisner's voice warbled with corruption, sounding as if two people spoke at once.

"Sorry, but the sword here made some good points. After all, how else can I serve you forever without becoming a Monster myself?" Eisner asked, speaking as if the blade had conversed with her. The sword had clearly wormed its way into her psyche, altering her thinking. Her innocent desire to be your pupil had transformed into a corrupted longing to serve you as a mere servant. Eisner, seeming to sense your pain, sauntered closer and placed a hand on your chest. Her other hand kept a firm grip on the cursed sword, dragging its blade up your thigh. "Why don't we commemorate this beautiful day, master? After all, today is the start of my eternal service to you~."