In a world filled with superpowered Quirk users, college student Kouichi Haimawari's dream is to become a hero just like the ones he so admires. Unfortunately for him, he finds out that there is only so much he can do with a sliding ability that gives him about as much speed as a bicycle. Thus, he is drawn to extra-legal, simpler work and takes on various local tasks beyond the grasp of the police and licensed heroes. However, a chance encounter with two misfits, a brash brawler vigilante who goes by Knuckleduster and the online sensation Pop☆Step, gives Kouichi the opportunity he has always dreamed about. With a dangerous new Quirk-enhancing drug turning ordinary people into instant villains, Kouichi finds himself accompanying the two in a quest to stop the drug from spreading. As the trio tries to get to the bottom of the case, the chaotic team looks to put a stop to wrongdoers that go overlooked by the law.

Long ago, harmony across the galaxy was maintained by a sacred star known as the Mother Planet. But that peace was shattered when the Mother mysteriously exploded and vanished without a trace. In the aftermath, the galaxy plunged into chaos and conflict. Yet from the scattered remnants of the Mother Planet, new beings were born—sentient fragments known as the Galverse. Now, these Galverse girls, each imbued with extraordinary powers and an unstoppable gal spirit, rise to confront the evil organization "Space End Society." As they battle across the stars, they begin to uncover the truth behind the galaxy's collapse—and the fate of the Mother Planet itself.

Prequel to .

On the day before her downfall, Lady Tiararose Lapis Clementille recalls that she is in an otome game that she had once played in her former life. She used to adore the main love interest Prince Hartknights Lapis-Lazuli Lactomuth, but unfortunately, she was not reincarnated as the heroine, but rather as is his worst enemy—the villainess fiancée. At their graduation ceremony, without blinking an eye, Hartknights condemns Tiararose for alleged crimes, breaks off his engagement, and proclaims the heroine Akari as his new bride-to-be. No matter whether Tiararose is innocent, he banishes her from the kingdom. But before her sentence can be carried out, a shocking figure appears. Aquasteed Marineforest, the prince of a powerful neighboring country, has been harboring feelings for Tiararose for quite some time, and announces his intention to marry her! Adored by the prince of another kingdom, what awaits the villainess on her path to a happy ending?