Alexander Toshihiko Seki is born the son of King Philip II of Macedon and Olympias, a feared queen described as a snake-witch and priestess. Driven by a hunger for speed and conquest, he heads into the woods with trusted companions Philotas and Hephaestion. There, he tames Bucephalus, a wild, man-eating horse, a symbol of the daring that will define his later campaigns. Around him, he befriends Cleitus and Ptolemy I Soter Shuichi Ikeda, who join his cavalry as the seeds of a legendary force.
Macedonia soon marches to war with Athens, led by King Philip II Yoshisada Sakaguchi and his foremost advisers—Attalus, Parmenion Tadashi Nakamura (Philotas’s father), and Antipater. Philip’s interest in Alexander’s whereabouts grows as the young warrior and his riders arrive just in time, breaking Athens’ lines and steering Macedonia to a decisive victory. Following the defeat, Athenian ambassadors repair to Persia, hoping to seal an alliance with the new king, Darius III. In a daring twist, Alexander and his friends slip into Babylon as Athens slaves, slay the guards, and provoke Darius to doubt Athens’ loyalty. Darius orders the execution of the ambassadors, while Alexander wanders into the Hanging Gardens of Babylon and meets Roxanne Yuko Minaguchi, a moment that intertwines beauty, fate, and ambition.
Ptolemy is captured by the Persian army and suspended in the air, yet Alexander saves him at the last moment by unleashing the horses in the city’s stables, creating chaos that allows the escape with his companions. Attalus schemes to drive a wedge between Olympias and Alexander, driving Philip to exile Olympias and to wed Eurydice, Attalus’s daughter, who becomes a potential heir to the throne. A grand ceremony to present the new prince—and a towering statue of Philip himself—ends in tragedy when the statue crumbles and a guard under Olympias’ influence assassinates Philip. It’s implied that Olympias then drives Eurydice and her baby to death, deepening the palace intrigue and bloodline struggles.
With Philip dead, Alexander ascends the throne and Attalus is executed. Athens, under Demosthenes, questions Alexander’s strength but is forced to yield after Macedonia’s crushing victory over Thebes. Alexander’s encounter with the philosopher Diogenes of Sinope, who embodies a starkly simple life and piercing wisdom, tempers his impatience and broadens his view of leadership [Kazuo Kumakura]. Soon after, Aristotle—Alexander’s former teacher—sends his niece Cassandra to join the cavalry, creating a bridge between philosophy and military power [Atsuko Tanaka].
As Alexander pushes east, his campaign sweeps through Persia’s territories with rapid, successive victories. He recruits the physician Phillipas to his side and slices through the Gordian Knot with his sword, a symbol of his willingness to break old limits. The Persian king’s forces strike a heavy blow, but a covert intervention by members of the Pythagorean cult prompts a deadly clash where Darius withdraws.
In Egypt, Alexander envisions a grand city, Alexandria, and encounters Dinocrates within his army, who inspires him with the dream of a lasting metropolis. Before leaving Egypt, the travelers visit the Temple of Ammon, where an oracle foretells that Alexander might be killed by someone he trusts most. Ptolemy later sees a prophecy that he will rise as a “Great King of the World.” A renewed threat from the Pythagorean cult targets Alexander during a wedding to Roxanne; a dancer carrying poison nearly ends his life, but the plot falters and the dancer is slain. Satibarzanes betrays Parmenion and Philotas, leading to the brutal execution of both Parmenion and Philotas.
Phillipas, who aided in healing Alexander, ultimately sacrifices himself after revealing the truth about the plot. Satibarzanes is dealt with, and Alexander resumes the campaign, marching toward India. Aristotle provides Cassandra with a parchment to deliver a crucial message when India is reached. In India, the expedition encounters a formidable Brahman army. Cleitus grows suspicious of Alexander’s aims and is slain in the ensuing clash while Cassandra’s parchment topples the spell that might have killed Alexander.
The march continues into India, where Alexander confronts a colossal army of those he has slain over the years. Hephaestion dies amid a spectral confrontation with the ghost of Darius, and Alexander faces a doppelgänger of King Porus in a symbolic duel that tests his resolve. After a confrontation with Pythagoras at the world’s edge, the mentor’s line—echoing Diogenes—suggests that destroying the world might birth something anew. Yet the world does not end: Alexander walks into a new westward destiny, a future charted by science and reason, and he departs toward Macedonia.
Back home, Aristotle receives a letter from Cassandra—she has chosen to stay with Alexander of her own will—yet the old philosopher is left with amnesia and cannot recognize his own niece. A handmaiden hints that Roxanne is pregnant, while a child named Euclid appears, carrying a Platohedron that hints at a future shaped by geometry and the sciences. The dark prophecy of destruction seems to transform into a dawning era, where Euclid’s Platohedron holds a place of honor in a world rebuilt by knowledge.
As Alexander’s forces prepare to depart for Arabia, the final image centers on Euclid’s Platohedron catching the dying sun’s glow, a symbol of a world reborn through mathematics and discovery. A statue of Alexander atop his horse stands in silhouette against a crimson sky, a reminder of a life spent chasing destiny and a future shaped by the new pillars of Euclidean geometry and Ptolemy’s enduring legacy.
