Skirmed's guide is better than mine.
So if there is someone who failed with Skirmed's method, follow mine.
Kokoro is my main character in DOA5U. so I am experienced.
I failed with Hayate, but I success with Kokoro.
Before start, make health max.
1) in first of match,
use 214p : shoot CPU to wall
2) Wall combo
pp, pp, 4p+k, pp2kp
3) when CPU wake up,
1. use 1kk : it makes CPU stun or wall hit
2. use 1p+k(charge)
4) when you are in pinch.
5) when CPU is stun in field (not wall),
use 7k, p6p, 2kp
6) when you and CPU are in mid-distance
use 6kp or 214p or 66p or 1p+k(charge)
7) If 1p+k(charge) is guarded,
CPU will take guard delay.use 66p, it will success with high probability.
8) when you downed,
hit wake up kick, and use 7k, p6p, 2kp.
Long and long prctice will be needed.