"Arcadia of My Youth: Endless Orbit SSX" is a 1982 anime series that serves as a sequel to the film "Arcadia of My Youth." Set in a distant future, the story unfolds in a universe dominated by the oppressive Illumidus Empire, which has subjugated Earth and other planets under its rule. The narrative centers on Captain Harlock, a legendary space pirate and freedom fighter, who commands the spaceship Arcadia. Harlock and his crew are dedicated to resisting the empire's tyranny and restoring freedom to the galaxy.

The series begins with the Illumidus Empire tightening its grip on Earth, now referred to as "Tochira," a desolate and heavily controlled planet. Harlock, driven by a deep sense of justice and a desire to avenge the suffering of his people, leads a rebellion against the empire. Alongside him are key crew members, including Tochiro Oyama, the brilliant engineer who designed the Arcadia, and Emeraldas, a fierce and independent space captain who shares Harlock's ideals. The crew also includes a diverse group of individuals, each contributing their unique skills to the fight against oppression.

As the story progresses, Harlock and his crew engage in numerous battles with the Illumidus forces, often facing overwhelming odds. The Arcadia becomes a symbol of hope for those oppressed by the empire, inspiring resistance movements across the galaxy. The series explores themes of freedom, sacrifice, and the enduring human spirit, as Harlock and his allies confront not only external enemies but also their own inner struggles and past traumas.

The narrative is punctuated by moments of introspection and philosophical reflection, particularly from Harlock, who grapples with the weight of his mission and the cost of his actions. The series also delves into the backstories of key characters, revealing their motivations and the events that shaped their lives. These personal histories add depth to the characters and provide context for their actions within the larger conflict.

Throughout the series, the Illumidus Empire is portrayed as a formidable adversary, with advanced technology and a vast military force. The empire's leaders, including the ruthless General Zeda, are determined to crush any resistance and maintain their dominance. The conflict between Harlock's crew and the empire escalates, leading to intense space battles, strategic maneuvers, and dramatic confrontations.

"Arcadia of My Youth: Endless Orbit SSX" combines action, drama, and science fiction elements to create a compelling narrative. The series maintains a focus on the central struggle for freedom, while also exploring the personal journeys of its characters. The story concludes with a climactic showdown between Harlock's forces and the Illumidus Empire, leaving a lasting impact on the galaxy and its inhabitants.