Chen Yu and Suika had no idea how long they had been walking. Looking at how much the surrounding terrain had changed, Chen Yu felt deeply troubled.
"Thousands of years have passed. Everything's changed." Chen Yu plucked a blade of grass and sighed.
"What was it like back in your time, then?" Suika asked curiously when she heard him.
"Hmm... buildings dozens of meters tall, streets full of people coming and going, and festivals bustling with noise, I guess?" Chen Yu thought for a moment and gave her a rough description.
Hearing his explanation, Suika couldn't help picturing what the future would look like.
Tall houses built out of wood, people everywhere in the village, and everyone gathering to chat whenever there was a festival.
That thought made Suika even more curious. "Wouldn't houses that tall collapse? I remember stacking some wood together once, and it fell down before it even got very high."
"Tall houses don't have to be built out of wood, you know. They use concrete." Chen Yu couldn't help smiling at her question.
"Concrete?" Suika looked utterly puzzled.
"You build houses using water, sand, stones, and lime. First, you use wood to set out the basic shape of the house, then pour concrete into it. After a few days, you remove the wood. The concrete inside has hardened by then, and the house is built. There's steel reinforcement, too," Chen Yu explained.
"That takes so many things! How soon could we build one?" Suika thought for a moment before asking.
"With Senku around, pretty soon. And in the future, he won't be alone. Lots of people will help restore society's order. But would that really be a good thing?" Thinking about what had happened thousands of years ago, Chen Yu wondered whether reviving people like them