Tristan Skeleton's life is already busy. Being the king of Skeletonia is no effortless task. With zombies roaming the earth and the human population reduced to villages, Tristan's plan is clear: protect and survive.
Surrounded by strong castle walls, security seems easy. That is until four uncanny zombies break into the Skeletonia library. After the break-in, Tristan discovers the undead have been developing their skills beyond their lethal bites. They're learning to read, wield weapons, and even use magic.
Tristan and his friends soon learn that Malice, a dangerous demon, is assembling her army of zombies, and it's up to them to stop her before she conquers what's left of the world. They must find the hidden Apocalypse Grimoire, which holds the key to Malice's defeat. But to do so, Tristan must cope with his forbidden powers.