Kazuki Yoshino and Yuuya Niyodo are idols who make up the duo ZINGS. While Kazuki gives his all in every performance, Yuuya views the job as just another means of making money. Yuuya's apathetic attitude toward the fans and inability to take his job seriously causes his manager to give him an ultimatum: unless he starts putting in more effort, he will be fired. Backstage, Yuuya meets Asahi Mogami, an idol dressed in a colorful costume. Asahi would have had a bright future ahead of her—had she not died a year prior. Even as a ghost, Asahi wants nothing more than to perform for fans again. When she finds out that Yuuya does not hold the same passion for the idol life that she once did, she is overcome by a fit of rage and demands that he let her take his place. In a strange twist, Yuuya wakes up to find that Asahi has possessed him and can do what he is too lazy to do himself. With Asahi performing for him, Yuuya thinks he has a ticket to an easy idol life. However, Asahi has other plans. Though she is no longer alive, she wishes for Yuuya to find the ambition that she still has. Together, she wants them to become the best idol the world has ever seen. But can an unmotivated man like Yuuya ever care about anything besides money?

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.

A force known as Astral power permeates throughout the world, wielded by astral mages. Fearing its destructive power, the Empire persecutes those who show their abilities. The tormented mages then founded the Nebulis Sovereignty to flee from their oppressors. Since then, the two nations have been in bitter conflict, the war still going strong for more than a century. After committing the great crime of freeing an imprisoned witch, the talented knight Iska is sentenced to prison. A year later, the Empire leadership suddenly decides to set him free, with the condition that he hunts down a fearsome mage known as the Ice Calamity Witch. Hoping to end the war, Iska agrees. Coincidentally, the Ice Calamity Witch herself, Aliceliese Alice Lou Nebulis XI, also wishes for peace and is willing to do everything she can to bring down the Empire. As Iska and Alice both yearn for a crusade that will turn the world into one without struggle, woe, or pain, the strings of fate tie them ever closer together, creating a bond that goes beyond something fabricated by mere coincidence.

Fudou Aikawa and Desumi Magahara have just started dating, but no one is allowed to know! Nicknamed Red Gelato, Fudou is the leader of Gelato 5, a group of heroes dedicated to protecting Japan. On the other hand, the Reaper Princess Desumi is one of the combatant leaders of Gekko, an evil secret society bent on world domination and considered Gelato 5's greatest foe. As they pretend to be mortal enemies, Fudou and Desumi sneak away from battle to spend time together. Despite their inexperience with romance, Fudou and Desumi strive to make their relationship work while avoiding suspicion from their comrades. With their loyalties divided between each other and their respective sides, the couple will have to stay on guard if they want to keep their love a secret from the rest of the world.