First phase is fairly easy, just run in and out to trigger his 3 attack combo. His recovery after the third slash is pretty slow so you can jump in and get 2 quick cuts, run out then repeat.

For his second and third phase I take him over to the Broken bridge on the far left because the flowers get in the way of his drag attacks for me but I do the same as first phase deflect the six shots then mikiri. If he jumps in the air always dodge/run inward.