"Guilty Crown: Reassortment" is a science fiction anime set in a dystopian future where Japan is under the control of a multinational organization called GHQ following a catastrophic event known as the Apocalypse Virus outbreak. The story centers on Shu Ouma, a high school student who becomes entangled in a rebellion against GHQ after encountering Inori Yuzuriha, a member of the resistance group Funeral Parlor. Inori possesses a unique ability tied to a mysterious weapon called the Void Genome, which grants Shu the power to extract weapons, known as Voids, from individuals' hearts. These Voids reflect the inner essence of their owners and vary in form and strength.

As Shu reluctantly joins Funeral Parlor, he is thrust into a conflict that challenges his ideals and forces him to confront the moral complexities of war and leadership. The group, led by Gai Tsutsugami, seeks to reclaim Japan's independence from GHQ and uncover the truth behind the Apocalypse Virus. Shu's ability to wield Voids becomes pivotal in their struggle, but his growing reliance on this power begins to take a toll on his relationships and sense of self. The narrative explores themes of identity, sacrifice, and the consequences of wielding power, as Shu grapples with his role in the resistance and the ethical dilemmas it presents.

Key characters include Inori, whose connection to the Void Genome and her enigmatic past play a significant role in the story; Gai, the charismatic and determined leader of Funeral Parlor; and Ayase Shinomiya, a skilled pilot who becomes a close ally to Shu. The antagonist, GHQ, is represented by figures such as Major Makoto Waltz Segai, whose ruthless tactics and obsession with control drive much of the conflict. The series also delves into the origins of the Apocalypse Virus and the true nature of the Void Genome, revealing a complex web of scientific experimentation and political intrigue.

The plot unfolds through a series of escalating battles, personal struggles, and revelations, as Shu and his allies face both external enemies and internal divisions. The story builds toward a climactic confrontation that tests the limits of their resolve and the bonds they have formed. "Guilty Crown: Reassortment" combines action, drama, and philosophical undertones, presenting a narrative that examines the human condition amidst the chaos of a fractured society.