Final score:

You are awarded a final score after 
finishing onimusha. If you have 30 
points, you will receive S class, in
which Kaede will have a new costume.
25-29 points will net you an A rating.
For 18-24 points you will receive a B
rating. 10-17 points will give you a C
rating. And for 0-9 points you will 
receive a D rating. You are scored on 
how many demons you killed, how many 
souls you collected, how many pieces 
of fluorite you picked up and your 
play time.