To enter these passwords, go to New York no Jiyuu na Ichinichi (Free & Easy Day in N. Y.) from the main menu, then select "go to Romando." Once at Romando, select "enter Password" during the dialogue with Kayama and enter the following codes (you do not need to have beaten the game to obtain these extras):
Most of these unlockable secrets require you to load saves from previous Sakura Taisen games onto the memory card you're currently using. The saves you load do NOT need to be complete game saves - it suffices to simply start the game in question and play only enough to save at the first save point. For those games applicable, you can go into Options and save game data without starting a new game at all, and that save would work as well.
To enter these passwords, go to Free & Easy Day in N. Y. from the main menu, then select "go to Romando."During the dialogue with Kayama, select "enter Password" and enter the following codes (you do not need to have beaten the game to obtain these extras):