The ninja package plan began in April 2013. Initially, tourist office officials were concerned that visitors might be hesitant to travel on unfamiliar routes while dressed in ninja costumes. However, such fears were soon dispelled. In fact, foreign participants quickly embraced the playful elements of the tour. For example, when they check into the Misugi Resort hotel, they receive missho "secret letters," spelling out tasks and how to behave as a ninja. As of spring 2020, a total of about 16,800 people from such countries as Italy, France, Spain, Thailand and Singapore had taken part in the tour, exceeding organizers' expectations. The tour was temporarily suspended due to the novel coronavirus pandemic, but resumed in October 2022, with more than 1,500 people booking tickets for the then upcoming six-month period.