Set in the aftermath of Millennium's downfall, Hellsing: Crimson Requiem follows the story of Vex, a rogue samurai, who joins the Hellsing Organization to combat a resurgence of hybrids and uncover the truth behind a mysterious project known as "Project Eden." Alongside familiar heroes like Walter, the Angel of Death, and the enigmatic Angel of Light, the team faces Reinhardt, a remnant of Millennium, who seeks to use Angel's unique power to create an unstoppable force.
As the battles intensify, Walter and Angel's deep, unbreakable bond is revealed, showcasing their history and love, which transcends missions, manipulation, and even time itself. Their transformation into celestial forms shocks everyone but becomes a symbol of hope and strength for the team. Through dramatic battles, heartfelt moments, and hilarious rivalries, the story weaves a tale of redemption, love, and unshakable unity as the Hellsing team fights to protect the world from destruction.