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Toilets at Oze National Park, which straddles the four prefectures of Fukushima, Tochigi, Gunma and Niigata, are in danger of disappearing due to a lack of donations from park visitors collected as upkeep expenses.

In hopes of resolving this crisis, the Oze Preservation Foundation, which looks after the park, launched a project using the so-called nudge theory in fiscal 2021 through March.

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