Are love and salvation possible at the end of the world? For core-user Sak, such a dream is unthinkable. Bullied by his peers at the war academy for his seemingly useless abilities, Sak spends every day focused only on survival. But when a deadly plague compromises the haven of his school, fantasy suddenly starts looking a whole lot more like reality. Now Sak must find his Caller-a person who amplifies his powers and who he’ll feel an innate, deep sense of affection for. The only problem? When he finally meets his stranger, he thinks Sak has lost his mind! In the face of unreciprocated feelings, weaponized distrust, and life-or-death stakes, can Sak and his Caller meet on the same wavelength?