Shanks Note:

The Hidden world beneath the sea floor, only one way in and one way out they say, but that was a long time ago. Now it's only a tale carried by the vast winds that blow across the blue seas.
Nowadays people are concerned with pirates, marines, nobles, etc. Dragons didn't exist unless it was a mythical zoan devil fruit of some kind.
One Dragon set out for adventure a long time ago, and now stumbled upon a nest of humans. It reminded him of home, but within this nest he grew quite fond of one in particular.
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