Ep. 12: Un niño de primaria visita a sus abuelos en la nieve y descubre una misteriosa cabaña de nieve con su 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)