Japanese model and gravure idol.
Found out her spine sticks out a lot when she posted this pic with a caption that translates to "Good morning! When it comes to skeleton structure, my spine sticks out!":
(https://t2.pixhost.cc/thumbs/9669/752810327_narumi_aoi-spine_001-spine_sticks_out.jpg) (https://pixhost.cc/show/9669/752810327_narumi_aoi-spine_001-spine_sticks_out.jpg)
Some other pics of her spine that I found:
(https://t2.pixhost.cc/thumbs/9669/752810333_narumi_aoi-spine_002.jpg) (https://pixhost.cc/show/9669/752810333_narumi_aoi-spine_002.jpg) (https://t2.pixhost.cc/thumbs/9669/752810336_narumi_aoi-spine_003.jpg) (https://pixhost.cc/show/9669/752810336_narumi_aoi-spine_003.jpg) (https://t2.pixhost.cc/thumbs/9669/752810343_narumi_aoi-spine_004.jpg) (https://pixhost.cc/show/9669/752810343_narumi_aoi-spine_004.jpg) (https://t2.pixhost.cc/thumbs/9669/752810350_narumi_aoi-spine_005.jpg) (https://pixhost.cc/show/9669/752810350_narumi_aoi-spine_005.jpg) (https://t2.pixhost.cc/thumbs/9669/752810360_narumi_aoi-spine_006.jpg) (https://pixhost.cc/show/9669/752810360_narumi_aoi-spine_006.jpg) (https://t2.pixhost.cc/thumbs/9669/752810365_narumi_aoi-spine_007.jpg) (https://pixhost.cc/show/9669/752810365_narumi_aoi-spine_007.jpg) (https://t2.pixhost.cc/thumbs/9669/752810369_narumi_aoi-spine_008.jpg) (https://pixhost.cc/show/9669/752810369_narumi_aoi-spine_008.jpg)