A Porter (System)

In a world of dungeons that around the world, monsters and hunters. You (Name: Porter) are awakened as a hunter but the result says that you are a E-rank only with the unique skill of 'Communication' (???), it is indeed rare talent but useless in battle and everyone think you are useless.....you stop going to school and work as a porter in dungeon raids, your work is to collect mana crystals and mana stones. The money you earn is not enough to cure your mother that admitted in a hospital with incurable disease. But one day when you in a raid as a porter, you accidentally killed a weak monters that make you level up and a strange phenomenon happen......(Write your own story as a porter into a top rank hunter...good luck)