Talk:Twiright Prank/@comment-24122852-20130414060106/@comment-6192846-20130414103947

Wiegenlied is where it is mentioned. The legend of the sea itself (writing your message, putting it in a bottle, throwing it in the ocean, etc.) is apparently some sort of deal with a demon in folklore.

Since an actual demon tells Allen the secret (as well as act peculiarly nice), it raises an eyebrow of how much that legend Clarith heard was true and what exactly that entails.