A Terrified Teacher at Ghoul School! Vol. 10 (manga)

Hyakki Academy's Night Parade Culture Festival has begun, and Haruaki's kicking things off by issuing the students and teachers a challenge--anyone who doesn't escape from his maze within thirty minutes will be forced to wear a sailor uniform for the rest of the day, and he's taking the competition very seriously! But when Haruaki later heads to the school's basement, he finds himself in another festival entirely...one run by the dead! Will our resident scaredy-cat make it back to the land of the living, or will he be trapped in the underworld for all eternity?