Momentarily New

An immortal being who does not grow old from the moment she became one, and a boy who gets reincarnated in every lifetime and dies at a young age due to "unnatural causes". She vowed to protect him this time to let him have a future he deserves. However, monsters are still around in sheep's clothing, lurking, waiting for a certain immortal's downfall within their grasps. The immortal girl only wishes to experience something new even if it is just momentarily with the boy's new lifetime, away from grief.