かつて起きた大火の折、邪悪な魔術師との戦いで功績を残したとされるギルベルト家。エーヴァルトは、この戦いで聖騎士団の総帥となり、王室より宝を受け取ったという叔父を尊敬していた。エーヴァルトはギルベルト本家の宝物庫で大切に保管されているというその宝が、魔術師の邪悪の力を閉じ込めた「ひとつきりの魔導書」ではないかと考えていた。しかし、この魔導書に似た本が裏マーケットで取引されていると知り…！？ 人気アプリゲーム「禍つヴァールハイト」に登場し、聖騎士団で活躍するエーヴァルトの学舎時代を中心に描いた少年少女の冒険譚！
It is said that the Emperor once opposed the dreadful “Lights” to protect his people from the Great Fire that ravaged the ancient capital. During the long battle that followed between Sacred Knights and Magicians, the Gilbert family distinguished themselves by defeating their leader, the “Pure Blood Sorcerer”, and thus brought peace to the Empire. As a reward for his service, Ewalt’s uncle Colin Gilbert was promoted to the rank of commander of the Sacred Knights unit and received a gift from the royal family.
While history tells us that the One Grimoire, the source of the sorcerers’ powers, was burned to the ground in exchange for their lives, Ewalt always suspected that the treasure so preciously kept in the storeroom of the Gilberts’ main residence was none other than this terrible artifact. So when a book resembling the One Grimoire suddenly appears in the black market, Ewalt goes looking for answers to preserve his family’s honor.
