Full name of the song: "Servant and Bird" by Hitomi

The English name is "If I were a Bird", included in "Reverse のルルーシュR2 O.S.T", 2008 It will only be released on August 27, 2018

There is an interception in decibels, you can listen to it first (5555~~Rolo~~)

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If you can read Japanese~~~~~~): http://www.amazon.co.jp/%E3%82%B3%E3%83%BC%E3%83%89%E3%82% AE%E3%82%A2%E3%82%B9-%E5%8F%8D%E9%80%86%E3%81%AE%E3%83%AB%E3%83%AB%E3%83%BC %E3%82%B7%E3%83%A5R2-O-S-T-TV%E3%82%B5%E3%83%B3%E3%83%88%E3%83%A9/dp/B001BOBYS6/ref=pd_sim_m_8