Dokutā Sutōn

"In a world of ever-changing data, you were the only constant I couldn't calculate."
Senku Ishigami deals in facts. Ten billion percent certainties. From the moment he met Reina Fujimoto, he knew she was the only one who could keep up with his pace. Logic meeting Emotion, the Rocket and the Heat Shield. But on the day the world turned to stone, a confession was left hanging in the air, swallowed by a blinding green light..
Now, 3,700 years later, Senku has awakened to a silent, primitive world. His goal remains the same: rebuild civilization from scratch. But there's a new variable in his equations now.
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Senku x OC

I took a picture from Google and edited it a bit so the cover isn't technically mine.