Hi, A 7 day pass would serve you quite well. But honestly, since it takes about 5 hours from Hiroshima to Tokyo by train, you simply cannot do it as a day trip, and you should add another day. If you are going to see Tokyo, you can largely skip Osaka during the day. After the temples of Kyoto close down around 5PM, you can zip over to Osaka for the evening. At night the city comes alive and has some great places to see, such as Dotonbori, plus the night views from the Umeda Sky Bldg and Abeno Harukas Bldg are wonderful. On another evening, you can also go see Kobe.
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A 7 day pass would serve you quite well.
But honestly, since it takes about 5 hours from Hiroshima to Tokyo by train, you simply cannot do it as a day trip, and you should add another day.
If you are going to see Tokyo, you can largely skip Osaka during the day. After the temples of Kyoto close down around 5PM, you can zip over to Osaka for the evening. At night the city comes alive and has some great places to see, such as Dotonbori, plus the night views from the Umeda Sky Bldg and Abeno Harukas Bldg are wonderful.
On another evening, you can also go see Kobe.