When it says: "A Secret is missing..." then you are missing the secret of the game.
That didn't answer anything. I did the Katana-tan fight already, so it's clearly not that. At least a hint on what to do would be nice.
The only reason this exists is to give a hint on how to get to the Katata-tan fight. If you completed the fight than this is just leftover code without hint. I see now why this can be confusing.
