Here is a rough travel schedule!
Please watch the video for details such as duration.

[Day 1] Haneda Airport → Hiroshima Airport → Bus to Hiroshima Station → Leave luggage at hotel → Train to Miyajima → Lunch at "Anagomeshi Ueno" → Miyajima → Itsukushima Shrine → Atomic Bomb Dome → Return to hotel → Dinner at "Kakiden" → Hotel

[Day 2] Hotel → Shimanami Kaido → Senkoji Temple → Stroll around Onomichi → Lunch at "Akatora" → Kosanji Temple → Mirai-shin no Oka (Hill of Future Hearts) → Shimanami Kurushima Strait Sightseeing Cruise → Dinner at "Okonomiyaki Kinokuniya Bun-chan" → Hotel

[Day 3] Hotel check-out → Train to Kure → Yamato Museum → Return to Hiroshima Station → Lunch at "Micchan" → Bus to Hiroshima Airport → Hiroshima Airport → Haneda Airport

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