The film serves as a prequel to the entire series by depicting Doraemon's life prior to traveling to the 20th century. It covers details such as his creation process, partial damage he sustained, loss of ears, and his encounter with the Nobi family. Ultimately, it portrays how Doraemon decides to return to the past in order to assist Nobita.
Nobuyo Ooyama, Koorogi '73 (Chorus)
Nobuyo Ooyama, Koorogi 73 (Chorus)