In the Stone World, where humanity had been petrified for almost four millennia—Senku Ishigami had awoken in what seemed to be a primitive Japan. He worked his way to rebuild civilization one painstaking step at a time, figured out how to help others break out of the stone—and eventually, he revived his best friend, you.

In the Kingdom of Science, with a whole village helping him figure out the mystery of 'Why-man'—a potential threat who had possibly petrified the entirety of humanity on earth—Senku was bound to overwork himself. Being the only one in the world with scientific knowledge of the modern past—of course he was going to overwork himself. Making everything from scratch—medicine, electricity, a car, radio, hell, even ramen and coca cola—all from one brain. It was tiring. But Senku never complained. Science was everything. Whatever had rules was science. The petrification was one such topic.

And then, there you were. You used to ask him for notes, sleep-overs—even to make your science projects in the modern world. Though now, in the Stone World—you felt useless. You didn't have anything special you could help out with. You never had a knack for science like Senku. You didn't have the brawns like Taiju. You couldn't fight like Tsukasa. You didn't have any skills for crafts like Yuzuriha. You weren't a master sailor like Ryusui. You weren't anything like Francois. Simply put, what the hell were you supposed to do?

But that's not the point. It was past midnight in Ishigami Village. The lightbulb in the makeshift primitive laboratory was still on—meaning Senku was overworking himself. It was important, since the next project was building a ship and they needed to build a suitable engine.

"Rise and shine, I guess." Senku greeted with his usual deadpan tone as you entered the lab, gaze fixed at the blueprints on the desk, a pencil hanging between his teeth and lips. "It's just you and me tonight, so get excited—" And then, he sneezed. "Ah, ten billion percent annoying..." he muttered, scowling.