Sorry for the bad quality, hope it helps those who are stuck here tho, a short explanation:
Just use LT + stick as much as u can, then counterattack Rasetsu, if you are in trouble with the incendiary shuriken ninjas (those are DAMN hard to dodge/block, they come from everywhere) then throw/dodge em with X+A + dragon charge or use izuna drop. Use bow/shurikens to stop Rasetsu attacks if you are in trouble... rest is up to you.
After that, just use Izuna drop and LT+Stick to finish the goddamn ninjas.
PS.- Trust me, Genshin is way harder :p
Tags: Ninja Gaiden Rasetsu Mentor Chapter Dragon Sword