As the Sekirei Plan's second phase unfolds, Shintou Teito becomes a restricted zone, trapping Sekirei and Ashikabi within its boundaries. Minato Sahashi, alongside his harem of Sekirei, must brace for fresh challenges as the rules undergo revision. Amidst the impending battles, some Sekirei face a dilemma: cherished by their Ashikabi, they are hesitant to risk their lives for victory. Unforeseen alliances and betrayals emerge, hinting at deeper entanglements within Minato's circle. Whispers of the formidable 'Single Numbers' entering the arena heighten tensions, while the enigmatic Game Master, Minaka Hiroto, watches events unfold with calculated precision.