Tokyo is suffering from a once-in-a-century pandemic. Yet the morning commuter trains are as crowded as ever. Toki is fed up with the suffocation of the mask covering her mouth, and the men who take advantage of the fact that their face is hidden by the mask to molest her. One morning, Toki orders a Toki (Japanese Crested Ibis) mask from a friend who makes masks of animals, and when she puts it on and gets on the train, she does something unexpected.

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