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Yoshiko is a hardworking high-school student whose free time is almost entirely taken up by attempts to help out a hikikomori childhood friend and an odd, reclusive uncle. While on a visit to her uncle's penthouse with two of her friends, Yoshiko notices a black substance that resembles snow beginning to fall from the sky—but her friends see nothing. Soon afterwards, a massive earthquake shakes the city, and Yoshiko, her friends, her uncle and his dog, all find themselves trapped in a strange w...