On the brink of death, an S-Class esper receives a heart transplant, only to discover that the heart bears another guide’s imprint. To survive, he must find its owner and keep him close. Meanwhile, an unregistered guide who escaped a secret research facility has lost all will to live since losing his fated partner five years ago. When a dangerously unstable esper appears bearing his imprint, a contract formed for survival gradually spirals into obsession, possessiveness, and an unexpected love that may save them both.