Zero was mankind’s first real superhero. Under his watch, countless other superheros appeared and followed in his footsteps. However, after 5 years of war, Zero disappeared without a trace. (Source: zeroscans)

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]

Sakurai Tomoki has settled into his life with the two angeloids, Ikaros and Nymph, and is enjoying himself immensely. However, he keeps having weird dreams and asks all of his friends to help him investigate the cause. Nymph conjures up a device that enables people, but not angeloids, to enter other people's dreams. The device malfunctions at first but eventually they get to what was supposed to be Tomoki's dream but discover that something is very wrong with it. Later, a meteor comes crashing down from the skies at the site of the large cherry blossom tree where Tomoki first discovered Ikaros. An extremely well endowed blonde angeloid with a huge sword emerges from the meteor and sets off in search of Tomoki!

An exoskeleton weapon engineered by Japan, Infinite Stratos (IS) can be piloted only by women. Its power and combat prowess are so immense that an international treaty has been signed banning its use as a military asset. When it is discovered that 15-year-old Ichika Orimura is the only male capable of steering an IS, he is forcibly enrolled in the Infinite Stratos Academy: an all-female boarding school, the students of which graduate to become IS pilots. At this training school, Ichika is reunited with two of his childhood friends, Houki Shinonono and Lingyin Huang, and befriends Cecilia Alcott, an IS representative from the United Kingdom. Guided by the legendary pilot Chifuyu Orimura—their strict homeroom teacher and Ichika's older sister—Ichika and the girls will need to use everything at their disposal to defend themselves and their academy against the dangers that will arise during the course of their thrilling school life. [Written by MAL Rewrite]