The protagonist, Kleik, accidentally transmigrates to Hell's Kitchen in the Marvel Universe. At the brink of despair, he awakens a System and receives a beginner's gift: the ability to summon the Shadow Army. To survive and build a future, he opens a shop in Hell's Kitchen offering intelligence, assassinations, and people-finding services, using the Shadow Army's unique advantages to take on all kinds of jobs. Kleik navigates between S.H.I.E.L.D., superheroes, supervillains, and forces from across the multiverse, sometimes working with others and sometimes facing challenges alone. He continually strengthens the Shadow Army and relies on his wit and courage to overcome crisis after crisis. In the Marvel Universe, he gradually grows from a transmigrator quietly struggling to survive into a pivotal figure capable of shaping events, while always holding to his own principles and writing his own legend on the boundary between hero and antihero.
It's nothing interesting, mainly because it's too useless