Ep. 12: Menino do ensino fundamental visita os avós na neve e descobre uma cabana de neve misteriosa com o primo

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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)