A Girl Called "The Crimson Lotus Witch" and "The Barrier Shrine Maiden"

The fortress city of "Tigros" -- it was one of the few places where people could live. The land contaminated by the "Invaders" had gradually become a place where people could only survive in areas where "Shrine Maidens" had cast barriers. Letia, one of the knights protecting such a land, continues to subjugate monsters created by the Invaders today as well. With her overwhelming annihilating power using fire attribute magic, she continued her solitary battles. At such a time, her superior Stella gives her an important mission. It was... to serve as the bodyguard of the Shrine Maiden who creates the barrier protecting this city. And that Shrine Maiden was none other than a mysterious girl -- Arne.