はるか未来。人類は地下シェルターの中で、徹底管理された生活を送っていた。「なぜ世界は滅び、人類はこのシェルターに籠らねばならなかったのか？」今日もヒストリー機関のメンバーは、過去の記録映像から世界滅亡の原因を議論する……たぶん。

A sleeping gigantic electric generation kaiju No.33, so-called Eleki-Magma, which the city relies on its electric power. One day, a mysterious giant robot Proto-Taitan appeared in the sky and destroyed the city! An accumulation of electricity, which lost its way in the body, has finally awakened Eleki-Magma!

In the not-too-distant future, androids have come into common usage. However, treating androids on the same level as humans is frowned upon, and there is constant paranoia surrounding the possibility of robots defying humans, their masters. Those who appear too trustworthy of their androids are chided and labeled as "android-holics". Rikuo Sakisaka, who has taken robots for granted for his entire life, one day discovers that Sammy, his home android, has been acting independently and coming and going on her own. He finds a strange phrase recorded in her activity log, "Are you enjoying the time of EVE?". He, along with his friend Masakazu Masaki, traces Sammy's movements and finds an unusual café. Nagi, the barista, informs them that the café's main rule is to not discriminate between humans and androids. While Rikuo tries to reveal Sammy's intentions, he begins to question the legitimacy of the fear that drives humans to regard androids as nothing more than mere tools.

In an underground world where tunnels extend everywhere, even though they live in dark and confined spaces, people wear protective clothes and lead quiet and enjoyable lives. Patema, a princess in her underground village, loves to explore the tunnels. Her favorite place is a "danger zone" that her village prohibits people from entering. Even though she's scolded, Patema's curiosity can't be held back. No one ever explained what the supposed danger was. On her usual trip to the "danger zone," Patema faces unexpected events. When hidden secrets come to light, the story begins to unfold.

In the far future when the continuity of the history has been lost, humans live in an ever more deteriorating completely artificial and enclosed world. The sea and the sky have disappeared, and the only window to "living" scenery exists in the records from the past, excavated in the relic.The Bureau of Record Excavation is an organization responsible for this task. Ura works for the 92nd office of the bureau. He is absorbed by the restoration of various records and fascinated by world of the past. Riko keeps a little distance to watch him, but averts her eyes from the records, believing that sometimes people just want things to stay the same.Everyone in this world knows that to know the past means to know the misery of this world, the present reality. But one day, Ura restores a strange video...