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.
Even a single grain is valuable.
.حتى الحبة الواحدة قيّمة
Ein Körnchen kann man
schon als Erfolg bezeichnen.
Un grano ya es fantástico.
Un grano ya se agradece.
Un grain, c’est déjà un miracle.
Trovarne un granello 
è già un traguardo notevole.
Um grão já é muito valioso.
Нужно дорожить каждой песчинкой.