After finding himself transported to a world where everything drops from monsters in dungeons, Ryota Sato learns that he has one unique skill: though he's stuck at level 1, all of his drop stats are S-rank! He uses that skill to the fullest, collecting drops and growing stronger with each passing day.

One day, Tellurium's dungeon chief summons Ryota to help with a rights dispute regarding a new dungeon on the border of the city. Sensing his chance to put his S-rank drop stats to a true test, he sets out on a new adventure with loads of surprises in store!