from Indianapolis International to LAX to Tokyo, it costs about 1,290 USD, Im not sure of the fares for bullet trains, but id have to them to get to Osaka, Kyoto, and Sapporo (nvm just looked it up, 280 USD for a train-pass type thing for 7 days which is how long ill be there)
this ammounts up to 1600 dollars or so travelling, and then 400 dollars spending money on food and such