The rule of the Demon King’s army, known as the “Demonic Era,” lasted for centuries. Countless heroes fell before the Demon King, powerless to stop him… Until the last hope, Hero Terios, finally struck him down. With peace restored to the world, Terios vanished without a trace. However, the Demon King—thought to be dead—miraculously comes back to life… as a dog!? Thus begins the tale of the last Demon King, now a fluffy canine, who just wants to live a peaceful life while protecting his granddaughter— who’s now being targeted by everyone in the world!