Ever wondered how it would feel to be isekai'd when you thought you died in an obscure alleyway?

Zero, in an unfortunate turn of events, was accidentally murdered in an alleyway with a brick.

Waking up in another world with a so-called System buzzing in his ear while being trapped within a dungeon filled with monsters.

Armed with the capability to imitate any skill or magic he's been hit by, Zero begins his journey in another world.

[This is my first work, so the start may be a bit rough. Criticism and suggestions about how to improve would be appreciated.]