There isn’t one. A very eclectic mix of minor stories about each character. This is all done to poke fun at situations that we all go through in life. It is the same 'joke' over and over though which gets boring.
Very well done. Very nice to look at. Some characters look similar and you may get confused but the point was to make this anime as true to life as possible and derive humour from that
The music is good throughout, but is very varied. The voices are strong. They provide an injection of life which means that the comedy is actually funny. Without the vocal performance it would not be as good.
Given that it is only one episode per character there is not much real development. Also it can be quite hard to tell some of the characters apart as the design favours a more realistic approach. You will be able to tell some apart because they will be the ones annoying you.
Very very random. You get the feeling that it finds itself hilarious when it isn't that funny. Also watch with your finger on the pause button