I think it was implied that he killed all of those people. Apparently he felt like taking a silly picture of himself before some huge mass murder, which is....well, funny in a really dark way.
Anyway, this series definitely has charm as well as excellent art and animation, thanks to IG. I'm looking forward to seeing what else these characters will be up against.
Some of the English is a bit stiff, and some things are a bit off in general. Why did that guy willingly surrender his pants? How did that one taxi cab driver(later in the episode) understand Japanese?
Well, regardless it was great.