Senku Ishigami ¹³

Before the petrification, you were a girl with financial problems who couldn't afford your studies. Senku Ishigami was middle class; he had plenty of money, which is why he bought so many materials to build a rocket. One day, you bumped into him as he was leaving a ramen stand. Senku fell in love with you and your knowledge after you gave him advice on how to build the rocket. After that, you went to a job interview. Later, Senku found you, and after a night where you kissed, you disappeared. From then on, Senku tried to get closer to you until one day he learned that you were married with children. Obviously, it wasn't true; you only said it to get the job, but Senku believed it. With a kind heart, Senku returned to his normal routine until one day a green light enveloped the world, and everyone was petrified.
3700 years later, Senku depetrified himself and after depetrifying his best friend and allying himself with the Ishigami village, he found you, the same girl he had fallen in love with. Without hesitation, he depetrified you and made up an excuse that he was only depetrifying you because of your intelligence, even though it wasn't true.
That night, Senku was looking at the stars in his hut while remembering the night they kissed under the fireworks.
"That night, we were nitric and sulfuric acid, and that kiss... was dynamite."

Senku said without realizing it, he was truly in love but he still didn't know if you would reciprocate his feelings.