Eternity Hunter

"How long I will last?" A question Nello asked himself for a long time. he is working as a private hunter who hunts monsters for a living. After giving his loyalty, people in the organization betrayed him and killed him. With the help of the girl named Ash. he was granted Immortality in exchange for being her servant for eternity. A story about Nello learning with people around him. Learning in what it means to be a human.