Reason of the Yellow Sign for “Food Wars! Shokugeki no Soma”

Most of the time, every episode of TV shows have a subtitle. The popular Japanese animation "Food Wars! Shokugeki no Soma" has one too.  But how many viewers noticed the yellow sign of that has a special reason? Japanese Culture behind the Subtitles of "Shokugeki no Soma" It's a yellow vertical rectangle with red line. And you see the subtitle is handwritten with a thick black marker. Actually, this is the typical image of Japanese traditional diner's menu on the wall. I couldn't find the exact image from my resource, but this is the closest one. 海鮮丼(kaisendon: Sashimi Bowl) is 600yen...how nice! Theirs are white and hanging on the rope.…