Shiraishi opened the first sushi conveyor belt shop in Osaka, Japan. The system, called kaitenzushi, was simple: Chefs would plate up sushi before placing it on a conveyor belt that ran through ...

On Twitter, Japanese users described the sabotage as ... One showed customers spoiling passing sushi plates by heaping wasabi on top of them. Another showed a diner licking the spoon in a communal ...

Suburban restaurants, which constitute 85 percent of the company’s approximately 640 outlets nationwide, served sushi on 120-yen ($0.86) yellow plates, 180-yen red plates and 360-yen black plates.