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Isaku-P (遺作P) is a producer who has been around since the early days of VOCALOID's Japanese rise in tenure. He tends to make a lot of ballads and uses multiple Vocaloids.
His only known series is the "Kagayaku Mion Shinseki Leones" series, a collection of songs meant for the fictional mecha anime of the same name. His most notable work on Niconico, "Kagayaku Mirai e", is from this series.