Interesting new concept i guess? Magical world x modern x isekai.
Still mystery, why only mc can see the store. and the teleport stuff how the store still appear in mc world? . Maybe it was same location as store in his world but cuz mc have a will to be a part timer he sucked to other wprld?. Like that was two world with same location just different world. that why when he entered back at his part time there was elf customer and not his world customer. Even if it was only his will. It still strange why only him??
Well whatever just enjoyed the story