Instead of a worm, Tokyo's early bird commuters could get free soba noodles with tempura if enough of them take part in a new plan to ease congestion on a busy line in the capital.

Under the plan, announced this week by Tokyo Metro Co., passengers would stagger their commutes during the morning rush hour on the Tozai Line subway services.

Following the launch of the initiative next Monday and continuing on weekdays until Feb. 1, Tozai Line passengers who register with the campaign will be eligible to receive coupons that can be used at Metro An, a soba noodle shop affiliated with the subway operator.