第1話: 大室がナセ家の思い出と、ミツキとイズミとの初期の戦士訓練を振り返る

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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)