A Tale of the Secret Saint Vol. 3 (manga)

Zavilia has joined Fia at the First Knight Brigade, but to keep her cover intact, she disguises him as the weakest monster there is. Unfortunately for the pair, Zavilia’s small size can only hide so much–as one of the three great beasts, his tremendous aura gives him away, and one person in particular is very curious. Despite the interloper’s politeness, Fia and Zavilia worry they’re about to be exposed. And with everyone out in the forest searching for the black dragon, Fia may end up under more scrutiny than is safe for a secret saint…!