My Unique Skill Makes Me OP even at Level 1

Ryouta Satou is an overworked salaryman trapped in a grueling job at a deeply exploitative company. His exhausting life takes an unimaginable turn when he is abruptly transported into the depths of an unfamiliar dungeon within a strange new world. In this bizarre realm, defeated monsters yield a wide variety of items as loot. Shortly after his arrival, Ryouta encounters a young girl named Emily, who helps him access his personal status screen to evaluate his abilities in this dangerous environment. The results are devastating. Every single one of his attributes, encompassing both physical and magical capabilities, registers at Rank F, the absolute lowest tier possible. To make matters worse, his character level is permanently locked at one. Facing seemingly insurmountable odds, Ryouta stands on the brink of total despair, believing himself completely defenseless against the threats lurking in the dungeon. However, a closer inspection reveals a hidden advantage that changes everything. Ryouta possesses a unique ability known as "Drop Skill: All S," recognized as the most powerful skill in existence. Armed with this extraordinary talent, he must now navigate and survive the perils of his strange new reality. The ultimate adventure of a hero who is simultaneously the weakest and the strongest is about to begin.