After beating the game, at the "END" screen, let the game sit there for one hour and thirty-one minutes. During this time, the end screen will go to grayscale, then to sepia-tone. At the end of this 91-minute period, the background music stops. At that point, press and hold Left, A, B, Select, and Start on Player 1's controller and Right, A, and B on Player 2's controller. This will bring some new music. When said music starts, press Right, Select, and B on Player 1's controller and Down, Right, and B on Player 2's controller to get Hidemushi's message. When it stops, press Up, A, and B on Player 1's controller for another message. After this, wait 18 minutes and you will return to the title screen.