Sky High (also known as Skyhigh) is a supernatural action film from director Ryuhei Kitamura. It is based on the manga of the same title by Tsutomu Takahashi and serves as a prequel to a Japanese television drama of the same name, and starring the same actress, Yumiko Shaku. Although the film is a prequel to the series, the film was made while the series was still in production, sometime between the first and second seasons. The film had a clear effect on the direction of the second season, as evidenced in the look and style of Mina/Izuko's second season costuming—more similar to the darker, edgier look she sports in the film, as opposed to the softer, colourful, kimono-like outfit of the first season. The film reveals how the somewhat meek Mina became the heroic Izuko, as seen in the series (and the film’s action climax). A serial-murderer is on the loose who just so happens to also be removing the hearts of his victims and taking them with him. His victims however, are not merely random humans as thought by the police. They are in fact, the past and present guardians of the gateway of the afterlife.