Zettaijou Senpai no Youkaigaku Kouza絶対城先輩の妖怪学講座; 绝对城前辈的妖怪学讲座; Apparition Studies: Lectures by Zettaijou-senpai; Lectures in Monster Studies by Zettaijou-senpai; Mr. Absolute Castle's Course in Ghost Knowledge; Zettaijou-senpai's Chair in Phantom Studies

Those who are troubled by strange phenomenon go to the forty-fourth room of the fourth floor of the fourth hall of Higashisei University’s Literature Department. There they will find Zettaijou Araya, a tall, pale, and handsome collector of all materials related to youkai. Perpetually clad in a black haori, he consults people suffering from supernatural problems. The season is spring, and the university campus is crowded with new students. One day, a freshman by the name of Yunoyama Ayane decides to pay a visit to a certain room...