sword master INFO

A tail of two master sword makes. what are there name. where can i
find the story. it was about them proving how make the better sword,
and something to do with a stream and cherry leaves.

A Muramasa and a Masamune were stuck into the sand of a river bottom

A leaf was floated down the stream and the Muramasa blade, known for
it's sharpness and bloodthirsty nature effortlessly cut the leaf.

Another leaf was floated down but this time the Masamune blade, full
of the good and honest spirit of the master swordsmith, did not cut
the leaf instead letting it pass unharmed...

-t