The weakest monster hunter in history

Story Description: This is a story about a young man named Kantaro aiming to live comfortably and become rich. The world is filled with monsters, ghosts, and monsters manifested by the void of 2030. In the world, monster hunters aim to protect people from the calamity of the monster attacks. Our main character is Kantaro ordinary man aged 19 who doesn't attend university, has no family and works a dead-end job trying to get by in this cruel world with zero interest in being a monster hunter. One day on one fateful night, he counters a lower-ranked monster which causes a chain of events that changes Kantaro's life forever.