Well, in the first chapter, when you look at the restaurant building, it says "chinesisches Restaurant" and "chinesische Küche" which is in German and basically means Chinese restaurant and Chinese kitchen... Where else could you find Chinese food but written in German? Just a thought.. (⌒▽⌒) maybe the artist found the background template and used it because they didn't have the time or willingness to draw the restaurant. ┗( T﹏T )┛

Wow, it's the first manga for me that sets in Germany. (⌒▽⌒) so unexpected (=・ω・=)