A Terrified Teacher at Ghoul School!, Vol. 16: Volume 16

Now that Haruaki's clumsiness has accidentally awakened the god of Hyakki Academy Island, it's up to him to figure out how to stop it from eating everything in the Pacific Ocean! And that's not the only supernatural disaster he'll have on his hands. While he, Hatanaka-sensei, and Nyuudou help Tamao get ready for his Spookology makeup exam, Tamao's divine youkai magic suddenly goes out of control, transporting them...back in time?! Will they manage to escape the past without changing their future...?