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Sayonara Dake ga Jinsei da (さよならだけが人生だ, Life is Only Full of Goodbyes) is the original song composed by Itou Kashitarou. It was released for the first time on August 17, 2014, in the album Circle of Friends Vol.3. Several months later, in January 2015, Itou Kashitarou uploaded new version of this song under vocaloid category, sung by Hatsune Miku.