I want to unregister from KakaoStory.
You can delete KakaoStory from the path below.
Settings >"Unregister" at the bottom of the page. 

Once you are unregistered from KakaoStory, your precious stories and friendships will be deleted permanently. All lost data cannot be restored, so please think carefully.  Please note that comments you have left on your friends' stories and photos will not be removed.