Of course, this is only possible because the store is located within Gate-city Osaki, a building complex where such well-known corporation as Sony and Adobe reside; most of the people found there are the employees of such big companies and they wouldn't risk the chance of becoming criminals.
Another cool thing with RELUCK's self-checkout cashier is that you would pay them using the Japan's famous Osaifu-keitai (i.e. RFID application for e-wallet built into most Japanese mobile phones).
If you choose to go self-checout at RELUCK, you would...
1. place your phone on the card reader
2. scan the barcodes of every grocery you are buying
3. check the total price and press "OK"
It is one of the places you should check out, if you have an osaifu keitai and a chance to visit Osaki.