Senku and the kingdom are going to need rations to be well during their attack on Tsukasa’s empire. There’s a science for that.
He found himself in an empty, primitive Earth.
.وجد نفسه في أرض فارغة بدائيّة
Auf einer primitiven Erde
ganz ohne Zivilisation.
In una Terra ormai tornata all'era primitiva
 e senza niente di niente!
Uma Terra dos tempos primitivos, sem nada.
На примитивной Земле,
где ничего не осталось.