By the advent of the 21st century, much of humanity was dead, having been trampled over by a new master, Godzilla. A select few among mankind took to the stars in a spacefaring vessel called the Aratrum in search of "the promised land," the planet Tau-e that could sustain human life. But the migration plan fails, and the remnants of the human race decide to return to Earth. But the distortions in space-time and the distance traveled means that mankind is returning to a completely changed Earth some 20,000 years later. The returnees, led by hero Haruo, prepare to take the fight to Godzilla based on a strategy that has been 20 years in the making. Carried out with the help of two alien species, the Exif and the Bilusaludo, the humans succeed in defeating Godzilla in a costly battle to the death.

But the victory is short-lived. Rising from the depths of the planet is a new breed of monster, dubbed "Godzilla Earth." Evolving for 20,000 years, the creature stands 300 meters high, weighs over 100,000 tons and wields such overwhelmingly destructive power that Haruo and company have no choice but to run for their lives.

Coming to Haruo's rescue, however, is Miana, a member of an aboriginal tribe called the Houtua. They are the first humanoid people the returnees have encountered. Could they descend from humans? "Our tribal god was destroyed by Godzilla. All that we have left are these eggs. Anyone who has tried to fight or resist him has been drowned in fire," the tribespeople say to Haruo, who responds with: "This is our last hope of recovering our home."

Meanwhile, Bilusaludo commander, Galu-gu is elated to discover that the Houtua tribe's arrowheads are made of a nanometal or a self-sustaining metal. It had been developed in the 21st century as an "anti-Godzilla" killer weapon deployed at their decisive battle fought at the foot of Mt. Fuji, but had been destroyed before it could be activated in the form of a "Mecha-Godzilla." The nanometal was its base substance, and proof that the manufacturing plant can still be used.

(Source: Official site)

Fifty years ago, an extraterrestrial giant of light known as Ultraman saved the earth but vanished. Ultraman's human host, Shin Hayata, was left with no memory of his time as a hero. Hayata's young son, Shinjirou, is found to have been born with a more powerful and durable body than any normal human. The organization who aided Ultraman, the SSSP, reveals Hayata's past to him. His father then dons a power suit again, assuming the role of Ultraman once more. One night, Shinjirou is attacked by an alien named Bemular and rescued by his father, who is severely injured in the battle. With dangerous aliens lurking in the city and Hayata out of commission, it falls to Shinjirou to pick up the torch. But in working with the SSSP as the new Ultraman, Shinjirou finds himself wondering how far is he willing to go to help people. [Written by MAL Rewrite]

In the 20th century, the world is experiencing a musical theater boom. Top performers known as Dai Stars enthrall the audience with their marvelous acting and singing. Among them, the greatest performers are given the title World Dai Star. Young and inexperienced Kokona Ootori dreams of being recognized as a World Dai Star. After multiple failures, she finally gets another chance to audition for the world-renowned theater troupe Sirius. Inspired by her best friend Shizuka, Kokona takes the first steps toward her goal and works hard to improve her acting. However, the world of theater is fiercely competitive, as many other girls seek the spotlight—including Kathrina Griebel, a talented performer from Germany. In order to fulfill her dream, Kokona needs to earn the right to stand on stage above all else.

Once upon a time, an unidentified enemy, the Unknown, suddenly appeared. The "Super Evolutionary Railway Development Agency," had developed the "Shinkalion," a robot that transforms into a bullet train, as a countermeasure against this threat.