i wouldn't go with citibank, they are less convenient than shinsei bank and their parent companies financial security is absolutely abhorrent, i'd feel as safe with them holding my money as i would with a career bank robber holding it.as for transfering and etc. you may want to use forex to transfer your money in this case. you said you have a lot of money to transfer so i'm assuming you mean something like over 30,000$ US. if it's less use a service like globex or another low commission currency exchange service to wire it to a yen bank account.
don't try to carry all that cash over here or they'll give you hell at the airport and there's always the off chance that you'll lose it.