Llew’s life takes a turn when her so-called friend accuses her of murder, sending her to the gallows. Llew survives, leaving a trail of death behind her. Unfortunately, she falls into the hands of Jonas: the man with the knife and the power to kill Llew’s kind. If Llew can nurture the attraction he has to her, maybe she can keep that knife from her heart. But lurking in the shadows is Jonas’s half-brother, Braph: the man who has learned to combine magics into infinite and addictive power.

Kaito, a young genius, gets sent to Mars to eradicate unknown creatures. There, the Martian Military uses puppets called Humanoid Weapons (HW) that can be controlled to fight for their cause. On Kaito's first patrol, he gets lost and finds a mysterious HW injured and left alone in a pile of rubble. But something about this HW is different... Together, they face the perils of dangerous creatures and internal conflicts as both fight to save what both care for most.