This is the Suicie Cliff. That's the Emperor and Empress bowing to respect thousands of Okinawa people who died jumping off this cliff. If you visit this island, you still can go to the edge of this cliff in Itoman Memorial Park.
I mentioned this cliff in my novel PAGI SEMERAH DAUN MOMIJI, on page 541.
(sorry, only in Malay language, but working on the English translation now).
" As later happened in Okinawa, Imperial troops encouraged and instigated group suicides, warning of the horrible fate that awaited anyone captured by the invaders."