It turns out that the travelers Ryoma saved were the local duke and his family. Impressed by Ryoma's various skills and enamored by his personality, they offer to take Ryoma along on their journey.
To be more accurate, they only eat grime, so...
...لأكون أكثر دقة، إنهم لا يأكلون سوى الأوساخ، لذا
Also eigentlich fressen sie nur Schmutz.
Para ser más precisos,
solo comen mugre.
Para ser exactos, solo comen mugre…
Pour être plus précis,
il mange uniquement la saleté.
Per essere precisi, 
mangiano solo sporcizia, quindi...
Sendo mais preciso,
eles só comem sujeira.