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To celebrate the 20
th anniversary of their idol
Mamiya Kazune, a group of people in their forties gather on
Kazune Island where they once spend a year together worshipping her. Looking back on their young days they are accompanied by
Kisaragi Uyuu and his assistant
Maina Touri, who are supposed to interview them and write an article about their reunion. Eventually a decapitated corpse turns up... on a snowy morning in August.