From what I've heard from people I've talked to, you pretty much have to have Japanese everything in order to play Japanese games. XD
Even without the TV... 300-some dollars for an Xbox360... around 80 dollars for the game... the DLC... the power converter... the shipping... *faints*
Thank goodness for people who post videos on Youtube/Nico Nico Douga, though. Otherwise, I might be curled up in the fetal position in the corner.
This question comes up alot, I think we should add it to the wiki or something?
To summerise:
Japanese Xbox 360 - runs on 120V (same as the USA/Canada)
Asian Xbox 360 - Runs on 220 - 240V - Works in Hong Kong, Singapore, The UK and most of Europe.
IMAS 1 (original) JP and Asia versions will play on both/either asian or Japanese xboxes (even if mix/match JP to asia etc).
IMAS L4U - Same as above, JP/Asian editions work on both JP or Asian xbox 360s.
IMAS2 - We don't know for 100%, but we are expecting the same as above (i have ordered as such).