On page 13, I count 51 targets on the ground. (Since I enjoy the manga and read through the chapter multiple times, I started looking at the details.)
And wow, that was quite the reaction when he was attacked with a throwing knife. From the way it was portrayed, he didn't stop to think for a moment and jumped straight to attack after sending the knife back to the sender.
That cleaning job is a perfect match for him. Not only can his slimes process all that sewage, but he can rebuild the wall afterwards to seal the basement from the dumpster. But why is a house right next to that?