LittleApple
Shouldn't she be dead by now since she traded everything of value she has even her life? Don't tell all this system does is boost the "costumer's" power because all I've seen is the system do is scan them for their rings, etc. then give them points to spend to make them even stronger.
I think it's similar to an achievement system where you gain stuff from your achievements but after you spend your achievement points you don't lose anything but gain something but you cannot get those same achievement points back also indicating in this case she cannot relocate the shop as it goes to different timelines in time in space and she hast to be lucky enough to find someone who is going through the door at the same time as it appears in front of them and follow them in in order to go again because of her SP Being not enough anymore only what she accumulated after spending and following him Or her in.