good first effort
as a first effort it's good. the art is impressive, but the animation is lacking. story wise, it's pretty cliche, i guess if i come across the rest of this series in the future i'll see how it turns out. keep it up.
and just to be further a jerk to the nice maker of this animator, here's some nitpicking:
1) the hitmen would almost certainly use silencers in their guns, if they were professionals. it's late at night and they really don't wanna wake anyone up.
2) the gunshot was from the top down on the head, there's no reason it should hit the fan in the ceiling.