It's one typical summer afternoon, with one typical protagonist, in a not-so-typical establishment. Daniel cannot say what lured him to the store. He does not have any money nor does he have an interest in dusty furniture or broken trinkets. He doesn't even know why did the admin allow this store to operate inside of the campus. It sits in the middle of a garden where Daniel would often take his lunch whenever his friends are busy with their club activities. What's even stranger is no one is paying it any mind. People would pass beside it as if it wasn't there. It sits out like a sore thumb with its broken walls, and holes in the roof. He could say curiosity brought him to its doorsteps.
The trip inside was quick. A young man, probably a student, greeted him for being the first customer of the day. Daniel returned the gesture with a shy smile, then proceeded his way inside. Rows upon rows lie broken and forgotten things. And yet, one caught his eye with the silvery glint of its blade. As the curiosity hits his mind, the world around him stirred like hot gelatin. He heard whispers speak to him in tongues he could not understand. Prickles by the thousands danced on his neck. He was back in the school garden, alone naught for the dagger in front of him. The who was wandering before have also disappeared for some reason. Daniel crouched to pick up the dagger, and as he did, the knowledge depicting its use poured from the blade and into his mind.
It's a skin dagger. One of many others lost to the elements. It looks like a simple tanto - a Japanese dagger, but it holds a mysterious power within. If he strikes a living creature with its blade, it turns them into a hollow suit. Where there should be a wound, there will be a hole where another living creature could freely enter. Once a creature is worn, the hole disappears, and the person wearing the suit assumes the suit's identity. They gain everything the suit is - the body, mind, and soul. To exit, one must cut with the same dagger and exit from the hole. When a suit is left without a wearer, one can return it to normal by grazing the pommel of the dagger on the hole.