Elegant Yokai Apartment Life Vol. 4 (Kodansha, 2017)

Yushi keeps plugging away at his mage training, while Hase gets used to the apartment's quirkiness after becoming a frequent visitor. But then one day, a surprising guest shows up who leaves Yushi with a deeper understanding of the world and how just how big it is. Around the same time, he hears a rumor about a ghost haunting the school. Could fate be pulling him deeper into the occult? Is it finally time to show the fruits of Yushi's training?!