Shu Zen

 long-told prophecy said a long time ago that Mother Nature had a beloved child. She loved her more than anything, even when her child took its last breath. Killed by humans and pursued by greedy demons, the indignant mother decided to put a curse on everyone's life. Nature was not what it used to be and could only be brought back into balance by the magic sword made by the best swordsmith Totosai. Shizen no baransu, that's what he was named and hidden in the deepest forests of japan feudal era.