It's the 21st century and Japan is ruled by a tyrant right after a massive holocaust. A wise seer named Nagi predict that a savior is born within a small, remote village called Byakko Village. Fast-forwarded it to a few years and Tatara, also known as the Child of Destiny (the said savior) has already grown up to be a teenager, along with his twin sister named Sarasa. Their peaceful lives were shattered when the ruthless Red King's army marched into the village and killed Tatara. Determined to help her village people and avenge her family's death, Sarasa took on Tatara's identity before leading her villagers to safety.

Wanting to help his bedridden mother, Hayato led the so-called supporters of Tatara into the gates of Shidou's castle despite Sarasa's warnings. They were instantly trapped by Shidou's men and was about to be massacred when Sarasa broke into the castle and saved Hayato. He then decided to follow Sarasa on her quest after his mother's death. While bathing at a nearby spring, Sarasa again met up with Shuri. They shared a moment together as Shuri was attack by an unknown assailant and Sarasa was by his side, nursing him back to health. Meanwhile, Shidou decided to postpone his marriage to Lady Shenju to prepare himself for war. Seeing Shenju's visible worries, Shidou eventually married her in a private ceremony.

Sarasa and Saki made it safely to the ‘main ship'. Unknown to them, Hayato had been captured earlier by the Koshou brothers (who leads both the Boat of Koshou and the main ship). They revealed to him that the real symbol of leadership (the Suzaku sword) was buried somewhere on the bed of the ocean and what they had is a fake. No time to get the cannon back to the cave, Sarasa launch an attack from the main ship, which instantly destroyed some of the Red Navy's ships. The Koshou brothers decided to flee upon hearing the cannon's blasts but was intercepted by Hayato who'd unmasked their fraud to the ship's inhabitants.