Kohaku has located the treasure left behind by Byakuya and the others, but it's encased in concrete. Senku has to devise a plan to quietly get at the contents inside, so as to not alert the guards.
The last one on Earth.
.الأخير على الأرض
Der letzte auf der ganzen Welt.
Le dernier de la planète.
L'ultimo esistente sulla Terra.
O último da Terra.
Последний на всей Земле.