Synopsis: my style of swordsmanship

Rio, a boy living in a remote village, attends the village dojo for self-defense, but gives up the idea 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!