After five years of harboring unspoken feelings, high-schooler Taiju Ooki is finally ready to confess his love to Yuzuriha Ogawa. Just when Taiju begins his confession however, a blinding green light strikes the Earth and petrifies mankind around the world—turning every single human into stone. Several millennia later, Taiju awakens to find the modern world completely nonexistent, as nature has flourished in the years humanity stood still. Among a stone world of statues, Taiju encounters one other living human: his science-loving friend Senkuu, who has been active for a few months. Taiju learns that Senkuu has developed a grand scheme—to launch the complete revival of civilization with science. Taiju's brawn and Senkuu's brains combine to forge a formidable partnership, and they soon uncover a method to revive those petrified. However, Senkuu's master plan is threatened when his ideologies are challenged by those who awaken. All the while, the reason for mankind's petrification remains unknown. [Written by MAL Rewrite]

Beryl Gardinant, a self-proclaimed "humble old man," is a sword instructor at his dojo in a rural, backwater village. In his younger years, he dreamed of glory as a master swordsman, but those days are long behind him. Out of the blue, he receives a visit from a famous former pupil who brings him world-shattering news—he's been appointed as a special instructor for the knights of the Liberion Order! With his life now turned upside down, Beryl travels to the capital and reunites with some of his former students: elite knights, an ace wizard, and even an adventurer who's attained the highest guild rank possible. But why do they all want his tutelage?! As far as he's concerned, they clearly don't need him anymore. Can Beryl live up to his new position? And will he ever get a moment's peace away from his adoring students?!

The third season finds Tokyo alight, as a mysterious affliction of spontaneously combusting rips through the city's population. Enter the Fire Force, with Shinra now part of Company 8 and prepared to save the city from oblivion — if he can keep his own secrets at bay.

After Marin Kitagawa introduced Wakana Gojou to the world of cosplay, he has been creating her outfits with ease. Even so, he still has a lot to learn, and every new lesson seems to strengthen his love for sewing and for the hina dolls his grandfather taught him to make. Meanwhile, Kitagawa finds it harder and harder to hide her feelings for Gojou. Friends and strangers alike constantly mistake them for a couple, much to Gojou's embarrassment. After all, in his eyes, their worlds are far too different for anyone to think they could be romantically linked. However, as Gojou spends more time with Kitagawa and realizes that his passions are not ridiculed by other people, a relationship between the two no longer seems so far-fetched.