Especially when travelling alone, such long journeys can be extremely boring. The plane is in this case the perfect alternative: if you can book in advance, low cost airlines can offer tickets to Shinjuku even cheaper than train tickets.
Which stations do the trains to Shinjuku leave from?
You can take the train to Shinjuku at HIROSHIMA STATION, HIROSHIMA or HIROSHIMA PORT(UJINA), which arrives at SHINJUKU-NISHIGUCHI, SHINJUKU(JR), SHINJUKU-SANCHOME or SHINJUKU-GYOEMMAE.
How long will it take you from Hiroshima to Shinjuku by train and when do the trains leave?
On average, it takes 9 hours and 44 minutes to get to Shinjuku by train, but you will need 9 hours and 9 minutes with the fastest trains. The first one is available at 21:04, whereas the last one leaves Hiroshima at 22:04.