足を斬られてダンジョンに置き去りにされた少年、強くなって生還したので復讐します（習作２） (Associated Names)

For some reason, the adventurer boy named Ryu could not raise his level from 1 at all, no matter how hard he tried. One day, however, he was forced to take on the task of carrying luggage for a dungeon raid. However, when the adventurers encounter a dragon in the dungeon, they slash Ryu’s legs…