A Terrified Teacher at Ghoul School Vol. 7 (manga)

Haruaki's summer has only just begun, and it's turning out to be anything but a vacation! Hospitalized after getting injured in a building fire, he'll be on a bumpy road to recovery as late-night medical horrors, an investigation into the mystery of how youkai are born, and a supernatural incident at Sano's part-time job won't give him a moment to relax!