Eldias Road: Megami ni Moratta Zettai Shinanai Kyuukyoku Skill de Nanatsu no Dungeon wo Kouryaku Suru

Eldias is an island where one can have a wish granted after conquering seven dungeons. On this island, where adventurers gathered and competed with each other, there was a boy who was a level 1 baggage handler. The experience he will need to level up was...... about 100 million! Despite the overwhelming odds that earned him pity from others, the boy will surprisingly become the strongest by using his Undying ultimate skill!

(Source: Pocket Comics, translated)