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Ikenai Borderline (いけないボーダーライン, Ikenai Bōdārain), translated as Forbidden Borderline, is an insert song sung by Walküre. It was first used as the ending song to Mission 0.89/Mission 01 of the Macross Δ television series. This song was first released on the digital single, Ikenai Borderline... ai character login