Ken, Toki, and Mamiya follow a trail of huge hoof prints left by Ken-oh's horse. Meanwhile, Ken-oh's Invasion Squad forces the villagers to pay tribute to him or be sacrifice, but Rin decides to stand up to them.

Rei arrives at Mamiya's village and rescues Rin. He confronts the leader of Ken-oh's Invasion Division, who tries to use Airi as a distraction. But Airi, spurred on by Rin's courage, gains the strength to fight for herself again. Rei goes on to defeat the Division leader, only to come face to face with none other than Ken-oh himself.

Rei challenges Ken-oh, but proves to be no match against him and is mortally wounded. Kenshiro, unable to save Rei, challenges Raoh himself, but even he too has difficulty defeating him.

Toki arrives at the village and interferes with Ken and Raoh's fight, revealing that Raoh was responsible for the death of their adoptive father Ryuken. Believing that Ken is not ready to fight Raoh, he paralyzes Ken and challenges Raoh himself.

Raoh gains the upper hand on Toki, but Ken breaks free of Toki's pressure point and challenges Raoh again. The two fight each to the point where they're both too wounded to continue, ending the battle in a stalemate.

As a result of his injury, Rei is left with only three days to live and symptoms of disfigurement are starting to show. Mamiya ventures into Medicine City by herself to search for a medicine to ease Rei's pain.

Mamiya is captured by Galf, the ruler of Medicine City. Ken and Rei rescue her, only to discover the "UD" mark tattooed behind her shoulder.

Ken and Rei learn that Mamiya was once kidnapped by a man named Yuda, who also murdered her parents. Rei reveals that Yuda is in fact, one of the Six Sacred Fists of Nanto along with Rei himself and the already deceased Shin. Ken and Rei head to Yuda's castle to confront him, but they only find his lieutenant Dagarl, who tells that Yuda has gone to the village of Blue Town.

Ken and Rei arrive at Blue Town assist a young group of rebels seeking to rescue their female friends and family from Yuda. However, the "Yuda" at Blue Town is actually a decoy. The real Yuda is revealed to had been hiding in his castle all along.

Ken and Rei return to Mamiya's village, with Rei at the verge of death. Toki offers to push a pressure point on Rei's body that will grant strength and increase his lifespan for another day, but the expense of great pain.

Yuda and his gang arrive at the village and takes Mamiya captive in order to challenge Rei to a match. Yuda reveals that he has harbored resentment towards Rei ever since they've trained together, due to the fact that Rei's graceful Nanto Suichōken is more admired than Yuda's own Nanto Kōkakuken style.

Yuda's henchmen causes a flood in the village that makes Rei stuck to the ground, giving Yuda a slight upper hand. However, Rei overcomes this and defeats Yuda with his ultimate technique. Yuda accepts his defeat and recognizes Rei as a stronger and more beautiful man. Yuda dies, but Rei himself does not have much time to live either.

In his last moment of life, Rei secludes himself from his family and friends and reminisces his adventures with Ken and co. while awaiting death. After dying, Ken cremates his body by burning the cabin with his body still in it.

Ken reflects on the life of his ally Rei, the man who sacrificed his life to save Ken.

Ken remembers Shu, a selfless man whose encounter with a young Kenshiro led him to his destiny.

Ken remembers Rei's battle against his rival Yuda, the man who once tormented Rei's beloved Mamiya.

Ken remembers Souther, the strongest of the Nanto Seiken masters.

Shin gathers his entire army for a meeting as he officially declares war against Kenshiro. Barcom, the General of King's army, tells his men how Ken defeated some of Shin's best fighters. Meanwhile, Yuria recounts to Saki how she came to be Shin's captive and his rise to power.

While cremating Toki's and Ryuga's remains, Ken remembers where it all began - with his old nemesis Shin, the man who engraved the seven scars on his chest and once kidnapped his beloved Yuria.

While pretending to be Ken's fiancee, Mamiya allows herself to be captured by Boss Fang under the condition that he releases Airi. However, Boss Fang does not keep his side of the bargain and forces Ken and Rei to fight each other for the safety of the women.

While Kenshiro and Raoh are mutually approaching the Capital of the South Star, Rihaku tells his daughter Toh about Hokuto Shinken and the history between Kenshiro and Raoh.

At Fudo's funeral pyre, the sole surviving member of the Five Chariots, Rihaku, remembers the sacrifices of his comrades as they fought to protect Yuria from Raoh.

A recap of Kenshiro's history from the day he first met Yuria as a child at the North Star Mind and Body Training Ground to his final battle against his eldest brother Raoh.

While awaiting for Ken's return, Bat and Rin reminisce of their adventures with Ken and the people they met up until this point. Ken-Oh's Royal Guards arrive at Cassandra to regain their hold of the prisoners' morale.

Ken challenges Uighur, the Warden of Cassandra, at the prison's courtyard.