He's lived for centuries—but meeting the girl sent to kill him may finally give his endless life a purpose.

Rain Jewlitt is an immortal bounty hunter with a price on his head and a mysterious past he can't escape. When a young assassin named Machika tracks him down, she's determined to kill him—but her plans change when she discovers the man she's hunting isn't the monster she expected. Instead, the two become unlikely companions as they travel through a dangerous world filled with bounty hunters, conspiracies, and people determined to uncover Rain's secret.

As Rain and Machika's journey unfolds, their relationship grows from distrust to deep friendship and something more complicated. Immortal Rain combines fantasy adventure, action, romance, and emotional drama while exploring immortality, loss, revenge, and what it means to keep living when everyone around you is destined to disappear.