The film, tentatively titled Gekijōban Mazinger Z (Mazinger Z The Movie), is commemorating the 45th anniversary of the original Mazinger Z manga and television anime series.
Mizuki has performed theme songs for the Mazinger Z TV anime series, Mazinger Z tai Ankoku Daishōgun, Mazinger Z Vs.
Dr. Hell, Great Mazinger, and Great Mazinger tai Getter Robo G – Kuuchuu Dai-Gekitotsu.
Watanabe’s father, composer Michiaki Watanabe, composed the music for Mazinger Z and its movies, and Great Mazinger and its movies.