Miku is a Spirit who is an idol and lady. She hates men to the point that Shidou even has to crossdress in order to interact with her.

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Just like Kotori, Miku was a normal human before she became a Spirit. Her angel is Gabriel, and she has the power to manipulate and brainwash people.

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Ever since she was little, Miku loved singing. She wasn't good at studying or sports, but she could sing better than anyone else around her. As an aspiring singer, she had always dreamed of performing on the big stage. That dream came true when she debuted as an idol singer at the age of 15, under the stage name Tsukino Yoimachi. It was the best thing that Miku could have wished for, doing the very thing she loved and being adored by her fans, she was having the time of her life. Her career however, came to an abrupt end just after about a year when she refused to, you know what, with a hotshot TV producer. Before Miku knew it, false scandals about her began appearing. She soon fell out of favour with her agency. Her fans started to hate her, and Miku thought that she could reconnect everything back with her singing, but she suddenly had lost her voice. As Miku contemplated suicide, Phantom appeared before her and made her a Spirit.