In the near future, humanity has taken its first steps towards journeying into the far reaches of the galaxy. Upon doing so they discover a huge race of insectoid aliens known as "Space Monsters." These aliens seem dedicated to the eradication of mankind as they near closer and closer to discovering Earth. In response, humanity develops giant fighting robots piloted by hand-picked youth from around the world. Shortly after the discovery of the aliens, Noriko Takaya, the daughter of a famous deceased space captain, enters a training school despite her questionable talents as a pilot. There, she meets her polar opposite, the beautiful and talented Kazumi Amano, and is unexpectedly made to work together with her as they attempt to overcome the trauma of war as well as their own emotions.

Virtual Reality and the arrival of Circlet Technology has changed people's lives. A new competitive electronic sport called Circlet Bout emerges, and schools duel to determine the strongest Circlet Bout Club and player. One day, Yuuka Sasaki gets mistaken for a challenger and battles against Chikage Fujimura, the best player in Japan, tying the intense fight despite her inexperience. These events lead to her passion for the sport, deciding to become a Circlet Bout player. Two years later, Yuuka moves to Tokyo and enrolls in Union School, a place where she can practice and pursue her dream of fighting Chikage again. After her arrival at the Union School, she discovers the club closed. Now her first goal is to help the athletic Miyuki Kasahara and club manager Ayumu Aizawa reopen Union's Circle Bout Club and return it to its former glory.

Once shunned by the art world, Perception Art has taken the world by storm. The medium has evolved to incorporate all five senses, allowing viewers to completely immerse themselves in pieces of art. As the son of the creators of this movement, Kazuya Yamanashi has inherited his late parents' talent and creativity for Perception Art. Now enrolled at Eisen High School, the first-year has his sights set on becoming the best Perception Artist. Kazuya has a reason besides ambition to attend this prestigious institution, as he hopes to make amends with his estranged childhood friend, third-year student Kyou Takise. But the rift between them may be difficult to repair since Kyou and Kazuya belong to different streams of study at the school. As luck would have it, the two are partnered for the exclusive Staircaser competition, in which the winners will represent Eisen for the year. In order to stand a chance against their competitors, Kazuya and Kyou will have to learn to set aside their differences first.

Upon first seeing Earth from the Azatos Empire's survey ship, Chief Investigator Liza Luna plans to eradicate every lifeform on it immediately, leaving behind only useful resources. While surveying the planet, Liza discovers that human civilization has evolved at a pathetic rate compared to other lifeforms. Liza makes her way to the surface of the planet to properly inspect and understand its inhabitants. Still convinced that there is nothing beneficial to be found, the investigator makes her way into a cafe to gauge the planet's food culture. Liza walks into a cat cafe, where she meets creatures far cuter than anything else in the galaxy. Motivated by this new discovery, Liza decides to investigate Earth's numerous adorable inhabitants.