The Daily Life of a Salted Fish Assassin in Anime Crossovers

I've traveled through time, and now I have a system.
But the system was a rip-off; it was supposed to take Jiang Hang to the world of Assassin's Creed, but instead it took him to the world of anime.
Jiang Hang's first opponent was the legendary elementary school student Conan, the Grim Reaper.
After several crashes, the original Assassin System was forcibly renamed the Detective System.
Jiang Hang thought, "Fine, I'll change my name then." But when he looked at the system rewards, they were still the same as the Assassin's.
Assassin's footsteps, concealment of presence, hidden blade assassination, mastery of poison, Spartan kick, Mystic Eyes of Death Perception... something seems off.
Although he really wanted to complain about this terrible clone system, after seeing that the system had deposited 100 million yen into his account as a settlement fee and that he would receive a reward of over a million yen for completing any case, Jiang Hang decided to become a positive-energy detective.
Using the skills of an assassin, wearing the guise of a detective, and doing the most positive things.
In short, this is probably just a story about a detective's daily life in a crossover anime world.