The year is 2356 A.D. - 189 years after a distant supernova caused a global catastrophe that wiped out 99% of the world population. To keep track on all space activities, mankind has built colossal space stations called "foundations" all over the Solar System. After passing the Space Academy entrance exams, Shima Katase embarks to the Earth-based foundation Stellvia to fulfill her dream of seeing the galaxy and to prevent another interstellar catastrophe from destroying Earth. (Source: ANN)

The story follows a boy named Quon and others who suddenly wake up with supernatural powers.

Ever since he was a child, Tomoki Sakurai has always woke up with tears after a dream of an angel. His childhood friend Sohara Mitsuki worries about this and decides to seek the help of Eishirou Sugata, an eccentric sky maniac. He concludes that Tomoki's dream is undoubtedly connected to what is known as the New World, a floating anomaly that scientists have failed to understand. Recruiting the New World Discovery Club's first members, Eishirou schedules a time to meet up in order to observe the mystery in the sky. That day, Tomoki's peaceful life is changed forever when a strange girl falls from the sky and begins to call him master. Sora no Otoshimono follows the daily activities of the New World Discovery Club as they begin to learn more about the Angeloids that have arrived on Earth. [Written by MAL Rewrite]

In a future where a massive disaster has devastated Earth, most of humanity has abandoned their physical bodies and relocated in digital form to DEVA, an advanced space station orbiting the ravaged planet. Free from the limitations of traditional existence, such as death and hunger, the inhabitants of this virtual reality reside in relative peace until Frontier Setter, a skilled hacker, infiltrates the system and spreads subversive messages to the populace.

Labeled a threat to security by authorities, Frontier Setter is pursued by Angela Balzac, a dedicated member of DEVA's law enforcement. When the hacker's signal is traced to Earth, Angela takes on physical form, transferring her consciousness to a clone body and traveling to the world below in order to deal with the menace. On Earth, she is assisted by Dingo, a charismatic agent, and during her journey to uncover the mystery behind Frontier Setter, she gradually discovers startling realities about the wasteland some of humanity still refers to as home, as well as the paradise above.

[Written by MAL Rewrite]