The Misfit of Demon King Academy, Vol. 4, Act 1 (light novel)

The war between demon and man has been successfully thwarted, marking the students' return to the Demon King Academy. If only peace were so easy to obtain. The people of Dilhade must now face the truth about the long-awaited Demon King and adjust to the abolishment of royalty. Anos must tread carefully—for old enemies, and even old friends, have been awaiting his return. A familiar face from two thousand years ago then arrives at the Demon King Academy—but he's somehow been possessed by a god! Nosgalia the Heavenly Father, who opposed Anos during the Mythical Age, swears to impose his downfall and return order to the world. But can order truly fight the foe that abolishes all reason? Find out in the fourth installment of The Misfit of Demon King Academy, the Great Spirit Arc!