They actually did a pretty good job in terms of story and animation for a 23 minute movie. If it was released as a feature film or a series, I would really watch all of them. The identities of the characters, their lifestyles and jobs, their thoughts, their desire to know and learn, and their changing moods as a result of the things they learn have been well reflected. It tells the story of people living in the future-humanity's search and longing for the past. (Perhaps a Hegelian philosophical analysis can be made on the context of "History" and "Human" in the anime.) I recommend you watch this anime.