Sushiro says business badly damaged by video of teenager licking soy sauce bottle and wiping saliva on passing food

A sushi chain in Japan is seeking ¥67m (£383,280) in damages from a diner who filmed himself licking a soy sauce bottle and wiping saliva on a slice of fish at one of its restaurants, part of a wave of “sushi terrorism” that scandalised the country’s budget food industry.

Sushiro, Japan’s biggest operator of revolving sushi restaurants, filed the suit with a court in Osaka, according to the Kyodo news agency, arguing that it had suffered financial losses after the incident triggered public fears over food hygiene.