Immortal Rain

Rain Jewlitt, known as the Methuselah, is a 624-year-old immortal man with eternal youth, dressed in priest's attire, and a hefty price on his head. Those seeking the secret to his immortality have put a bounty on him, making him a highly sought-after target. Machika Balfaltin, a spirited 14-year-old girl, sets out to claim the bounty after her grandfather's death, as it was the one mission her assassin grandfather, Zol the Grim Reaper, could not complete. However, instead of killing Rain, Machika finds herself being repeatedly saved by him from other aspiring bounty hunters who attack them both, leading to an unexpected turn of events.