Level 1, but the strongest with unique skills (1-13 volumes)

Publisher: Kodansha
Author: Cotton, Subachi, Nazuna Miki
Size: 128mm x 182mm
Number of books: 13
Language: Japanese
Category: Shonen manga, manga
Latest release date: 2024-01-09

Synopsis:
Ryota Sato, a black company, transforms into a mysterious dungeon, where everything is dropped from monsters.
Moreover, all statuses such as physical strength and magic power are "F" (weakest), and the level is fixed and in the worst state of "1" (lowest) ... !!
With the only hope and mysterious unique skill as a weapon, can Ryota survive in this mysterious world!???