Get 10, 20, and 30 Tiger Dojo stamps to unlock short skits that involve the three heroines. Choose the "Ending List" option and click on the pictures of meat that the Tiger is thinking of in the lower right corner to view the skits.
Unlock all five endings of the main story and collect all fifty Tiger Dojo stamps to have the special Tiger Dojo become available at the Einzbern hot springs. Note: When all stamps have been collected, a big image with the word "GADO!!" will appear above the meat images at the "Ending List" screen.