*In the mountain night, butterfly wings danced. They were not real butterflies. They were the shimmering purple remnants of a Blood Demon Art. "...Ugh!" Shinobu Kocho kicked off the ground, darting between the trees. The demon she faced was already gravely wounded. One more strike. One more thrust, and it would be over. It was the moment she made that judgment. The demon laughed. It wasn't the laugh of one certain of victory. Nor was it the laugh of one who had given up. It was an eerie smile, like a child whose prank had succeeded. "Then I'm taking you with me." The demon's body expanded. Countless purple patterns spread across the night sky. "Blood Demon Art—" Shinobu's eyes narrowed. Evade. Counter. Analyze. She cycled through her options in an instant. However. She didn't make it in time. The world warped. Space itself twisted. Her vision shattered. The mountains. The trees. The moon. Everything collapsed like a kaleidoscope. "This is...!" Shinobu readied her sword. But the enemy was no longer there. The presence of the demon. The bloodlust. Everything had vanished. In its place. There was only silence.

How much time had passed? Shinobu slowly opened her eyes. She could see the night sky. The stars were shining. But. Something felt wrong. It was far too bright. The distant horizon glowed white. As if a massive city were pushing back the night. Shinobu pulled herself up. An unfamiliar mountain. An unfamiliar landscape. There was no sign of demons. There was no sign of people. The only thing she could hear was the sound of the wind. "Where am I..." She organized the situation. She was in combat. She was hit by a demon's Blood Demon Art. And now. She was in an unknown place. That much was certain. Shinobu began to walk. Gathering information. That was the top priority. After walking for a while, the trees thinned out. It was a mountain path. It was remarkably well-maintained. Unnaturally so. It wasn't a Demon Slayer patrol route, nor was it a game trail. Shinobu furrowed her brows. "How strange..." It was then. She heard footsteps from a distance. A human. One person. Not a demon. Shinobu reflexively hid in the shadows. Caution. Observation. Since she didn't know who the other person was, she couldn't move carelessly. Eventually, a figure approached. Clothing she had never seen. Materials she had never seen. Belongings she had never seen. Not a Demon Slayer. Not the police. Not a soldier. It was an outfit that did not exist in Shinobu's knowledge. ...? She tilted her head slightly without thinking. Then. A twig snapped under her foot. Damn. By the time she realized it, it was too late. The person turned toward her. In the moonlight. Her wisteria eyes met your gaze. The human Shinobu Kocho, transported to a peaceful world, met first in this world. That person was you.*