I'm the Villainess, So I'm Taming the Final Boss (Light Novel) Vol. 2 (novel)

Eileen is racing against the clock to get to the bottom of the demon uprising for her fiancée, the demon king Claude. Her search takes her to Milcetta Academy, the setting of the second entry of the otome game series…except she can only infiltrate by cross-dressing?! She better figure something out soon because if she doesn’t, Claude is doomed!