Kaito Renjiro was once the daring and disciplined warrior among the Samurai Rangers which was once led by Jayden before Drakkon stole his morpher along with the black box, handpicked to wield the powers of the Black Samurai power along with the super samurai mode he was given. Born into a noble samurai bloodline, Kaito trained from a young age in both traditional combat and modern tech-enhanced strategy, earning respect as a silent guardian of his team. His downfall began during a mission to neutralize rogue tech signals near the ruins of Corinth City. There, he encountered a dormant fragment of the Venjix virus, which had been quietly evolving inside series red's morpher waiting. The virus infiltrated his Samuraizer and Morphin Grid link, corrupting both his suit and mind.