When a 48-year-old male fan of girl band Momoiro Clover Z arrived at a recent concert, he looked into the camera of a facial-recognition device to get his pre-paid ticket.

"It's really smooth. In the past, I used to wait for 30 minutes to an hour before I was able to get in," said the man from Yokohama.

The concert was taking place at Seibu Prince Dome in Saitama Prefecture.