It is a semi-fictionalized account of the life of Tetsuya Yamagami, the main suspect in the assassination of former Japanese prime minister Shinzo Abe.

Revolution+1 follows the life of Tatsuya Kawakami, a semi-fictionalized version of Tetsuya Yamagami, the suspected assassin of former Japanese prime minister Shinzo Abe.

The film covers major events in Tatsuya's life, including the suicide of his father, his family's inability to pay for treatments for his brother's blindness, and his mother's membership in the Unification Church.

After his mother's donations to the church leave the family in financial ruin, Kawakami is compelled to assassinate Abe for his ties to the organization.

[4][7] Adachi stated that he "felt a sense of urgency" to produce the film, and that he wished to create and release it "before the media was able to distort the situation and propagate the shooter’s criminal profile or their version of his grounds for this incident".