Darkside Blues (Japanese: ダークサイド・ブルース, Hepburn: Dākusaido Burūsu) is a manga series by Hideyuki Kikuchi. The story has been adapted into an anime film directed by Yoshimichi Furukawa. The film was originally licensed by Central Park Media and then later licensed by ADV Films. The story involves the town of Kabuki-cho, home of a resistance faction called Messiah. In the futuristic setting, Kabuki-cho is one of the last places of freedom because the Persona Century Corporation has taken control of the majority of the Earth. Kabuki-cho is hence known as "The Dark Side of Tokyo". Furthermore, a mysterious stranger called Darkside appears to protect the citizens of Kabuki-cho.
三位小魔仙希雅、海昕和夏凡在化解了海萤堡的灾难后，回到人类世界-悦悠岛，成为了海洋保育馆的见习保育员。在保育馆的见习生活中，她们学习了解到各种海洋知识，并积极参与到救助海洋生物的行动中。 然而，一个自称“铁鹰战队”的神秘团队突然造访悦悠岛，利用各种高科技装备，四处捕捉各种海洋生物。这一切原来是精于制造各种机器的幻仲博士在幕后指使的，希雅、海昕、夏凡三人随即用魔仙力量与之展开一场保护海洋生物的战斗……
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