Superhero Ultraman was spotted around JR Meguro Station in Tokyo last week and again on Tuesday.
Awed eyewitnesses spoke in hushed tones as Ultraman, or a fan dressed as him, entered the station and then turned around and left after station staff asked him to remove the mask.
Shinsuke Yoshizawa was among those who glimpsed the superhero at around 8:30 p.m. on Tuesday, while parking his car near the station to pick up his child.