第12話: 小学生の少年が雪の降る祖父母の家を訪れ、いとこと一緒に不思議な雪の小屋を見つける

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A boy in elementary school has been brought to the snowy country by his parents to visit his grandparents over winter break. He doesn't often see snow, so he's overjoyed to have snowball fights and build snow huts with his cousin. Then, in a grove of trees, they find a snow hut with no entrance... (Source: Crunchyroll)