This may or may not be on topic, but there's a game called Mario no Photopie. In the first eras of N64 emulation, no graphics plugin cound render this game. Lately, technology has developed to the point where it has been possible to emulate this game's graphics, but not the input. Even though it involves 64DD emulation, it's not like microphone input for Hey, You, Pikachu! or anything. It seems to want to read a file/disk for storing some kind of data, which seems more implementable in an input plugin.
But, even if you can get the game's graphics booting (which is best done as of now on Mupen64 or Nemu64 if you want sound), an error message comes up in Japanese (game was only released in Japan). No one yet has translated this text, but I have made a Flash imitation of the game with the inaccurate texture mapping for it fixed so it is easier to read. Now, since you are in Japan, I figured you might have a translation for this text. Perhaps even a way to simulate this input.
http://img354.imageshack.us/my.php?image=marionophotopiepf5.swf
Once this error message is prevented in emulation, you will be able to get in-game and the game will be playable (unconfirmed, unless 64DD is actually emulated fully). That is, only when using Mupen64 with Rice's Video Plugin/Direct64/Glide64 and your input plugin.
Information on this input I have found here.
http://64dd.net/modules/newbb/viewtopic.php?topic_id=160
While it may require new hardware, can a sort of camera function/whatever the hell this game is asking for be attached to the input plugin?