So, this is our current plan.
Day 1: Arrival at Osaka at 7pm local time.
Day 2: Visiting Osaka
Day 3: Travel from Osaka to Koyasan early in the morning, visiting Koyasan
Day 4: Travel from Koyasan to Nara early in the morning, visiting Nara
Day 5: Travel from Nara to Kyoto after having lunch.
Day 6: Visiting Kyoto
Day 7: Visiting Kyoto, might check visiting Himeji if possible
Day 8: Travel from Kyoto to Hiroshima early in the morning, activating Rail Pass, visiting Hiroshima/Mijajima
Day 9: Travel from Hiroshima to Tokyo early in the morning, visiting Tokyo for a while
Day 10: Travel to Fuji (discarted) ?????
Day 11: Travel to 5 Lakes early in the morning, get back to Tokyo early in the night
Day 13: Travel to Kamamura early in the morning, get back to Tokyo after lunch, visit Tokyo
Day 14: Travel to Nikko early in the morning, get back to Tokyo after lunch, visit Tokyo
Day 15: Visiting Tokyo
Day 16: Visiting Tokyo, leaving to the airport at night since flight leaves at 10:20 pm