There's an election next week in Japan, so election posters are everywhere. They all follow a basic design – name, face and perhaps quote. I don't know if there are rules on their design, or it's just one followed for convenience. There are rules on their display (apart from on your own property) – roadside signboards are divided into numbered squares and each candidate is randomly assigned a number. This is revealed early one morning at the start of the campaign period, and alert candidates immediately go round putting up posters in the allotted space.
Otherwise, posters bloom on private property on street corners.
The "nazi" symbol in the photo probably doesn't indicate fascism, or even politics. It might be a graffiti tag, a Buddhist symbol, some personal graffito – or a nazi comment. (Searching just B and E online doesn't reveal much!)