Ceres: Celestial Legend, Vol. 10 - Monster

Their search for the celestial robes or 'hagoromo' resumed, Aya and Yuhi transfer to another new school. Here, their problems are more serious than just making new friends. Aki is on campus and making Aya's life hell. And then there's a kind of actual hell itself, in the form of a beneath-school passageway, where a creature is said to roam.