Professor, are you okay?

"Huh? What's that noise?" The old man furrowed his brows, his face darkening slightly as if he'd overheard someone muttering something about not letting him continue his research. A faint trace of anger flickered across his expression.

But the young female intern suddenly froze, her eyes widening in terror as she stared past the old man, her gaze fixed on something behind him. It was as if she'd seen a ghost.

Because, out of nowhere, a figure had appeared behind him.

And in their hand, they held a long, gleaming tachi.

The blade shimmered with a cold, deadly light, razor-sharp and brimming with murderous intent.

The old man sensed something was wrong. He began to turn his head to look behind him, but he only managed to turn halfway before a sharp schlick echoed through the room. His head was severed cleanly from his body, flying through the air.