Magical Explorer, Vol. 6 (light novel)

Iori finds a legendary tome in the depths of a dungeon that could lead to world war if it falls into the wrong hands. But when the Three Committees launch an investigation into the document, they end up discovering that the school librarian, Rue Sakura, is actually an archangel! The Academy wastes no time in attempting to subdue her, but Rue effortlessly quashes its resistance with her powerful magic. Just as all hope seems lost, Takioto rushes in to confront Rue once again! Does he have what it takes to avert the ultimate bad ending?!