Grandpa System: An Average Teenager Commoner's System Tale [LITRPG]

[NOT A BL STORY!] [PURE HAREM OF A MAN AND MULTIPLE WOMEN!] [NO NTR!] An RPG game-like system appeared 100 years ago and granted humanity chances to become stronger. Along with the system, other worlds and gates appeared too. Since then, hunters have become a popular job. The world's ten richest people are hunters. Not only are they riches, they also have high status in this world too. Hazel Larson attends a hunter academy in order to become a hunter. He wants to become rich by becoming a hunter, but there is another important reason why he wants to become a rich hunter. He wants a beautiful wife! Hazel works hard to bring happiness to his future wife. The ordinary Hazel's life started to change when he found a relic that sealed a powerful succubus from another world. The sealed succubus told him about the power inside the ring, the power system to get stronger by acquiring affection from other people. However, there was an error. The ability mutated! Hazel can only become stronger by acquiring affection from old men! And thus Hazel's story of acquiring and stealing the hearts of powerful grandpas all over the universe began. He also didn't forget to conquer side chicks on his path to become stronger.