A Terrified Teacher at Ghoul School!, Vol. 14 — Mai Tanaka

The principal's identity has finally been revealed, and he's none other than Abe no Seimei's old rival -- Ashiya Douman! Until now, retrieving each fragment of Haruaki's soul seemed a tall task, but with the headmaster's power, success is all but assured! However, the Divine Beasts aren't going down without a fight, and they've still got a few tricks up their sleeves…