Last episode of "Straight Title Robot Anime" is not what I expected

Disclaimer - Contains Spoilers.Proceed if you have completed it  

Straight Title Robot anime is a short title of 12 episodes ,each episode of duration of 13 minutes.

The basic format of almost every episodes - It opens with a very bombastic opening with various  mecha fighting each other with a hot blooded theme song.After the intro, the narrator tells us that it been years after humanity has gone extinct and robots created for combat have been fighting an endless war,while a text scroll informs the viewer that this anime is for those who enjoy seeing cute robots while they do some inoffensive investigation. In a barren landscape with a few ruins of damaged skyscrapers in background , we see three "female" robots  namely Katou - the librarian robot ,Fujii- the maid robot and Mori-the industrial Robot are pondering on ways to stop the war.

 They believe that solution lies in learning something humans used to do -  laughter. Usually various aspect and genre of comedy is touched here which is already  stored in their database along with reference to Japanese comedians( whom I don't know ) as they try to comprehend and re-enact it.Then they go to one of biggest simulation room and simulate various "comedic effects" on the world, which results in many odd things happening the opening intro. They they randomly choose shops or services of humans,and try to make sense out of various articles in their own way.At the end after the ending song follows next episode preview featuring parodies of various mecha anime next episode preview parody art  and catch phrase being cut short.

For 11 episodes it follows the same routine with variation here and there.The only interesting part  consistently throughout the series was the weird simulation they run.Otherwise most of the time it is these 3 robots just talking to each other and doing prop comedy. Sometime they are meh, sometime funny and sometime they are just  a chore to watch. As you progress though the episodes,you start to get the pattern and character quarks which  becomes quite enjoyable near the end. Time to time,narrator passes remarks on their activities,their conclusions to tough subject of comedy and their character.

And then came the last episode.Without the intro,they continue their daily routine as usual,until Kotou calls out the narrator this time. Later it is revealed that Narrator was a robot all along ,watching them from a distance. And he also laugh,which Fujii the maid robot notices soon.Then it was revealed the narrator robot was actually assistant to last Human researcher who was trying to program human emotion,specially laughing to robots. The big simulation room and database were actually his lab,where he was doing his research. He came there to help the trio after their appeal over a radio broadcast. Then the narrator robot proceeds to gives them a floopy disk that had laughter program. 

When asked what he defines laughter is, he answers, "Laughter is being able to have freedom from law and enjoying it at any moment" . They run the program in the simulator and what they witness is all robots just shut down. To the trio's astonishment Narrator robot knows the flaw in the program. Reminding them of his definition of laughter , he points out that robots who had been hardwired to follow orders programmed in them  shut down after conflicts and contradiction arises from the program that forces them to commit the act of laugh. He bids farewell and  shut downs ,leaving the fate of robots in the trio's hand.

After witnessing that they were right being laughter stopping the war but not in the way they intended,Kotou and Mori decide that Fujii should take the  decision whether  to upload the program to every robot or let the things be as usual,since she was created to be closer to humans.Fujii declares that she r actually never served any human,Kotou convinces her to think the program being work of his master. After a thought, Fujii who has been the "butt-monkey" for the sketch routine in previous episodes, says,

"God created Humans which were incomplete .Humans created Robots which are more incomplete.

Let a new life be born on earth,that is neither human,nor robot".

Thus,Fujii uploads the program.For a brief moment,Trio experience laughter and one by one shut down with Fujii being last.Ending sequence now shows us robots which are now turned off,lying among the ruins.

For a short series that remained pretty bland and lighthearted till penultimate episode,last episode was just punch in the guts. It was unexpected and very sad ending.Considering how silly it was most of the time ,last episode turned out to be very heavy in terms of themes and emotions. But then considering the subject,who knows it is what the creators were aiming for at the end.