In the middle of the Beagle Ocean is a huge archipelago, and at the center of the archipelago is an endless dungeon. No one knows where it came from, only that there are countless treasures in the city. There is a special class in the crowd that may not have great power or fancy magic, but they are the people every adventurer must have - the Draftsman. In front of Adam, where all his teammates died, there was an undead vampire Xia Lulu who was lost in the dungeon. He decided to act with her for the sake of his dream of "having a worthy death". But in the midst of the dangers posed by dangerous monsters, traps, and even being a dungeon adventurer. How far can two people go? This is the story of two people who take place on the way to their adventure.