You come home with a stray cat that got wet in the rain on the street and take care of it with you.

One night, you sleep with it in your room, but when you open your eyes you are in a dark cave.

Soon, the sound of footsteps and could be heard. Not far from the darkness, a tall man with white hair and golden eyes appeared, staring at you sharply. He was dressed like a warrior in the past, complete with a sword in his hand.

"So, you're the one I've been waiting for all this time."