From StrategyWiki, the video game walkthrough and strategy guide wiki
Go to the melee ring to test your melee abilities, talk to the guy in the black cloak to start the test.
Just kick Whisper's ass again, you have to hit her 7 times with only being hit once or less to get an A+ and the reward.
- Beating Whisper with an A+ earns you
- 1 x Iron Katana