Koushakuka No Ryouriban-sama ~300-nen Ikiru Chiisana Ryourijin~公爵家の料理番様 ～300年生きる小さな料理人～; The Duke's Chef: A Little Chef Who Lived For 300 Years; The Duke House's Little Chef

A boy named Lushel, whose father is the "Sword Saint", gets disowned in the mountains because of his weak constitution. He is forced to live a life of survival, alone, in the mountains where magical beasts live. However, he found out by chance that monsters can be consumed, and he was able to acquire skills by eating them...!