I'm Quitting Heroing, Vol. 8 -

The Hero Commences Operation "Save the Demon Realm"!To take down Undine, the raging spirit polluting the demon realm's waters, Leo and Echidna must enlist the help of the priestess Crocell. There's just one problem--Crocell absolutely refuses to cooperate! As the former hero and the Demon Queen try their hand at negotiations, Echidna discovers just how important it is for a ruler to love her people...and why, perhaps, she--not Leo--is the one who belongs on the throne. Will Echidna regain her confidence in time to carry out their plan?! The fate of the demon realm rests on this final, epic confrontation!