Madam Merry-Go-Round

EC ??? Madam Merry-Go-Round is a speculative song released in September 1, 2010. The keywords which mothy gave are: 「ようこそ　愉快な国へ」 (“Welcome to a happy place”) This song has a connection to Red Shoe Parade and makes an obvious reference to "utopia".
 * Nicovideo Broadcast
 * Youtube Broadcast with subtitles

Plot
The "Queen of the Amusement Park" greets the visitor all while dangling in chains, offering various attractions to the visitor, like a ferris wheel and a haunted house, and potentially giving herself up to whatever the visitor wishes. However, it becomes apparent that the visitor would never be able to leave this "utopia"...ever.

According to mothy, Gammon Octo believes that this will happen to the Clockwork Doll if she continues to pursue the Deadly Sins and create "utopia". The Clockwork Doll disagrees with him though.

Singing Roles
Miku Hatsune as "Queen of the Amusement Park"