Dr. Emotionless

The day Kiyotaka and Kei decided to announce their relationship to the whole class, a green light came out of nowhere covering the whole school, if not the whole planet, petrifying all humans.
After 3715 years Kiyotaka broke out of the stone, now that he is in this situation what will he do? how will he survive, will he find other humans?
author notes:
this was a suggestion from @blackgamer90 I had some good plot ideas and decided to write it, and because I'm a Kiyokei shipper/ Kei simp. There will be a lot of Kiyokei moments, I will include a lot of cote and dr stone together and make them interact... .