故事以住在修道院中的少年「奥村燐」作為主角。繼承了青焰魔之血的他，他的資優生雙胞胎弟弟「雪男」以 13 歲的最年少記錄就獲得了驅魔師稱號，然而燐卻完全不知道自己未來想要做什麼…。就在某日，燐的面前出現了一位自稱為其父親的魔神(青焰魔)，並計畫將他帶到惡魔居住的虛無界。而修道院的神父、同時也是燐的養父「藤本」為了保護燐而喪命，燐因此決意成為最強驅魔師並為養父報仇，打倒魔神。

Much more than just the world's largest Cross: the Valley of the Fallen [Valle de los Caídos] is history carved in stone. It's the Basilica, the abbey, the College-Choir School, the guesthouse. Besides being a place of worship, since 1958 it has been home to about twenty Benedictine monks. Some of the first ones still live there. It also housed, until 1982, the Centro de Estudios Sociales [Center for Social Studies]. All of this is now under threat.

This documentary aims to shed light on the history and significance of the Valley of the Fallen, explaining when, how, and why it was built, while debunking the main myths surrounding it.