Ep. 1: Hiroomi reflexiona sobre los recuerdos de la familia Nase y su entrenamiento de guerrero temprano con Mitsuki e Izumi

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Hiroomi talks about his memories of the Nase family. In order to become a great Spirit World Warrior, Hiroomi is taught to persevere at an early age. Alongside Mitsuki, his loving little sister, is the strict and tender Izumi, who watches over the siblings. (Source: Kyoukai no Kanata Wikia)