My Unique Skill Makes Me OP even at Level 1

Satou Ryouta, a salaryman working for an exploitative company, suddenly finds himself inside an unfamiliar dungeon in a strange world where monsters drop all sorts of items as loot. With the help of a girl he happens to run into named Emily, he's able to check his own stats... and finds that all of them, both physical and magical, are at rank F ! What's more, his level is stuck at 1 ! Ryouta is on the verge of utter despair... but then he learns that he also has "Drop Skill: All S," the most powerful unique skill there is!...