My Style of Swordsmanship

Rio, a boy living in a remote village, attends the village dojo for self-defense, but gives up, feeling that he cannot become stronger under the dojo's teaching methods. However, the village is a dangerous place, and Rio decides to create his own way of fighting—"Garyu Kenjutsu"—in order to survive! A royal road fantasy of swords and magic is about to begin!

(Source: Mag Garden, translated)