Kamimura Riddle

A cat is picked up by a human on a rainy winter day. But unfortunately the anticipated savior is an ex-yakuza with a scary look.

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!