The episode is just a summary of all the events that have happened thus far from Koga's birth to Aria's death at the hands of Mar's

After briefly mourning the death of Aria, the Bronze Saints prepare to enter the Twelve Zodiac Temples. They are greeted by Aries Kiki, who explains the situation and how they are to proceed. Taking him for an enemy, Kouga attacks Kiki, to what he responds by restoring the Pegasus Cloth and also revealing to them the crucial secret of the Seventh Sense. Realizing Kiki is not an enemy, Kouga proceeds to the Temple of the Golden Bull, where he is challenged by its guardian, Taurus Harbinger, and a deadly battle ensues. Meanwhile, Kiki restores the remaining Cloths, and stays behind the teenagers, to battle alone against a large group of Martians.

After the defeat of Kouga at the hands of Harbinger, the remaining Bronze Saints engage him in battle, meeting with utter defeat. Harbinger reminisces about his difficult childhood and what drove him to a life of violence, to become the strongest and eventually a Gold Saint. Managing to recover after witnessing the defeat of his comrades, Kouga attacks Harbinger with a single blow imbued with all the power of his Cosmo. Much to his surprise, Harbinger emerges unscathed and his comrades have vanished.

Dragon Ryuhou arrives to the Temple of the Twins, being greeted by a strange, peaceful atmosphere and talking animals. Gemini Paradox, the guardian of the temple, gently welcomes the young Saint and exposes to him her motives for her allegiance to Mars, and reminisces about her past. Disagreeing with Paradox's amoral perspective, Ryuhou engages her in battle, managing to overpower the gentle Paradox. Much to his surprise, she emerges full of hate and with no trace of her previous loving personality. Meanwhile, Aquila Yuna arrives to the Cancer Temple.

Yuna arrives at the House of Cancer, and she is greeted by the deathly atmosphere of the gates of Praesepe. The guardian of the House, Cancer Schiller, engages her in battle, reminiscing about his past and motives for his allegiance to Mars. Aiming for Yuna's utter defeat, Schiller tries to break her morale by toying with her psyche, having Yuna fight her deceased friends Arné and Komachi. Meanwhile, Kouga continues his battle with Harbinger. After another clash between the two Saints' greatest techniques, Kouga heads towards the exit. Admiring his determination, ...

Koga arrives at the Gemini Temple. He and Ryuhou join forces in order to defeat Gemini Paradox. Despite their best efforts, the two of them are outclassed by the more experienced warrior, especially when her darker half comes out to fight. Incensed by Paradox's selfish nature, Ryuhou manages to awaken the Seventh Sense and pull out a desperate win at the last minute. Ryuhou and Kouga the head off to the Cancer Temple.

Because of Schiller's Praesepe Underworld Waves, Yuna leaves the earthly plane and finds herself in the deathly Hill to the Land of Spirits. Terrified by the sight of the souls of the deceased and visions of her sordid past, Yuna cowers until the arrival of Kouga, who suffered her same fate, and losing his temper due to Schiller's mockery of Aria's death, Kouga is consumed by the Darkness Cosmo inside him. Managing to calm down Kouga, Yuna engages the Cancer Gold Saint in battle once again, and drawing from her bonds to Aria and her comrades, she finally finds the ...

After Cancer Schiller's defeat, the Bronze Saints prepare to proceed further into Sanctuary. Meanwhile, Orion Eden reminisces about his late friend Aria. The grief-stricken Bronze Saint begins to question Mars' motives and their legitimacy, going as far as to challenge his master Leo Mycenae because of his loyalty to Mars. Mycenae and Eden engage in unequal combat to prove their conviction.

After leaving Eden, Mycenae returns to guard his House, where Haruto and Souma arrive promptly. The young Saints find themselves to fight their way through the House of Leo, but the ferocious Mycenae proves to be an almost impossible foe to overcome, even when the two teenagers fight him together and neutralize his King's Roar technique. When he unleash his King's Emblem, Haruto risks his life by stopping Mycenae's final attack. Souma retaliates with a Lionet Bomber powerful enough to crack one of the shoulder pads on his Gold Cloth. The fierce determination of the ...

Upon arriving at the next temple, Haruto and Souma are confronted by Virgo Fudo, a gold saint whose cosmos surpasses that of all the Gold Saints in the earlier temples. Yuna, Kouga, and Ryuhou join the battle in time to save their friends from a crushing defeat. But even the combined powers of the five Bronze Saints is no match for Fudo. When all hope seems lost, Eden arrive at the last minute and protects them from one of Fudo's techniques.

Eden takes over the fight against Fudo after blasting Kouga and the others out of the Virgo Temple. Following a desperate battle, Eden manages to defeat the Virgo Gold Saint when he awakens the seventh sense. At the same time, the other Bronze Saints attempt to use the opening he gave them to go to the Libra Temple. Unfortunately, they are confronted by Tokisada, the new Aquarias Gold Saint and the man who killed Haruto's brother. His apparent ability to control time makes him a powerful adversary and Kouga is defeated with little effort.

Libra Genbu interferes in the battle between Tokisada and the Bronze Saints, teleporting everyone to his temple. To the shock of the Bronze Saints, Genbu takes over the fight and declares his loyalty belongs to Athena, to Saori Kido. While Tokisada is a powerful warrior, Genbu wins the fight. In a desperate gamble, Tokisada attempts a powerful technique to take the Bronze Saints with him but only manages to suck in Ryuho and Haruto. Koga, Souma, and Yuna proceed to the next temple with Genbu's blessing.

Souma and Sonia, who has been given the Scorpio Gold Cloth by Medea, engage in their long awaited final battle at the Scorpio Temple.

Eden arrives at the House of Scorpio, watching Souma right next to Sonia's body. Souma apologizes to Eden before moving to catch up with Kouga and Yuna. Meanwhile, Haruto and Ryuuhou awaken at the End of Time, finding themselves confronted by Tokisada, whose time-manipulating powers have regained their strength after his fight against Genbu. From the moment the battle begins, Tokisada easily gains the upper hand against the two Bronze Saints' combined strength. At the same time, Kouga and Yuna reach the House of Sagittarius, supposed to be protected by Seiya. Upon ...

Kouga and Yuna reach the House of Capricorn where they meet Ionia and learn from him his reasons for betraying Athena. Kouga attacks the former Headmaster of the Palaestra, but is once again immobilized by his Domination Language technique, and his Darkness Cosmo is brought out. Before Yuna is able to help Kouga keep the Darkness Cosmo at bay, Ionia buries her in a rubble of books, facing Kouga alone. However, after succeeding to repress the Darkness Cosmo in his heart, Kouga awakens his Seventh Sense and finally kills Ionia with the legendary Pegasus Comet Punch.

The Bronze Saints finally arrive to the House of Pisces, guarded by the ruthless Amor. After separating Kouga and Yuna from the others, Amor summons Mars' strongest warriors, the Four Heavenly Kings to fight the others. While stating that the Heavenly Kings are stronger than the Gold Saints, Amor immobilize Yuna, forcing her to watch her friends being attacked without resisting. Kouga, the only one capable of attacking, is restrained by Amor's Arrested Judgement, a special attack that can only be broken by Darkness Cosmo as part of Medea's plan to have him unleash the...

Kouga defeats one of the Heavenly Kings in one hit before he manages to once again keep his Darkness Cosmo due to him having reached his Seventh Sense earlier and Yuna calling out to him. Sending him ahead, Yuna engages Amor while Souma, Ryuuhou and Haruto engage the remaining three Heavenly Kings, using the last bit of strength they have left in order to finally defeat them. Leaving the rest to Kouga, they collapse to exhaustion. Amor decides to fight Yuna, but is interrupted by Eden who has arrived as well. Following a short fight, Yuna asks Eden to go onward and ...

Kouga finally reaches Mars' location, determined to stop him. As the War God deflects his attacks and counterattacks, Eden arrives in time to save Kouga. Mars then reveals to the true story from the days when he was known as Ludwig, a normal human who sought revenge for the death of his beloved wife, Misha. He deflects Eden's attacks before removing his mask, revealing himself as a human no longer.

Sending Kouga ahead Eden awakens his Seventh Sense and challenges Mars, immobilizing him with his Cosmo. Eventually, while Kouga struggles to retrieve Aria's staff at the top of the Sanctuary, Mars breaks free and grievously wounds Eden, temporarily defeating him. Pursuing Kouga, Mars easily shrug off any attack from the Pegasus Saint until Eden finally catches up to the two. Bringing their Cosmos to the limit, Kouga and Eden finally defeat Mars together and have Ludwig return to his senses. However, just as Ludwig is about to retrieve Aria's staff to prevent Earth's ...

As Earth's Cosmo is transferred to planet Mars, Medea drains the darkness Cosmo from Ludwig's body and transfers it to Amor, before she departs to Mars. After revealing all the suffering and prejudice he has suffered along with his sister during his childhood, Amor attacks Kouga. Eden joins Kouga against him, but when Amor transfers the battlefield to Mars, where his powers are increased to the same level as Mars possessed, Kouga finds on it an opportunity to retrieve Aria's staff and stop Earth's destruction.

After infusing the Darkness Cosmo in Kouga's body, Amor finds out that he was betrayed by his sister from the beginning and swears to kill everyone including her, knocking out Eden in the process. Meanwhile on the Earth, Kiki, Harbinger, Fudo, and Genbu use their Cosmos to send Kouga's friends to Mars. As he finally reunites with Saori, Kouga is overcome by the Darkness Cosmo and possessed by the God of Darkness, Abzu, who kills Amor in one single blow. As the possessed Kouga now proceeds to kill Athena with his own hands, his friends try to have him return to his ...

Eden tries to stop Abzu with no success until he gets the chance to obtain Aria's staff to confront him. Medea tries to dissuade him, but he refuses to comply and reclaims the staff by force. With Kouga's friends failing to get him back to normal despite everyone awakening their Seventh Sense, Eden eventually returns with the staff to the battle, just to find it destroyed by Abzu. Just as Eden is about to be dealt the final blow by the God of Darkness, Medea stands to protect her son, sacrificing herself for him. However, Eden is still dealt a heavy attack while the ...

Yuna, the only one left standing after Abzu's terrifying onslaught against Kouga's friends, is encouraged by Athena to fight against Abzu in order to bring Kouga back. However, all her attempts fails, gaining her darkness wounds for each attempt. Just then, the fragments of Aria's staff combined with Kouga's friend's Cosmos awaken Seiya, who has been trapped in the depths of the red planet all this time, waiting for a chance to stop Abzu's plans. The Gold Saint confronts Abzu and manages to drive him from Kouga's body with aid from Yuna. The God of Darkness then flees...

Abzu tries to have Kouga under his control once more with no success and his attempts to kill Saori are stopped by his desperate efforts. Once feeling the radiance of his Cosmo, Kouga's friends send the last of their energies to assist him. Infused with the power of his companions and protected by Aria's light, Kouga manages to rescue Saori and destroy Abzu for good. As Earth regains the Cosmo that was siphoned from it, the planet returns to normal and the corruption that has spread into the Saints' bodies is washed away. After a brief encounter with Aria's spirit, ...