"Death Note Relight 2 - L's Successors" is a condensed retelling of the second half of the original "Death Note" series, focusing on the aftermath of L's death and the rise of his successors, Near and Mello, in their pursuit of Kira. The narrative begins with Light Yagami, now fully embracing his role as Kira, consolidating his power as the new L and working within the task force to eliminate criminals while maintaining his facade of innocence. The death of L leaves a void, and two prodigies from Wammy's House, Near and Mello, emerge to continue the investigation into Kira's identity.

Near, a calm and analytical thinker, adopts a methodical approach, while Mello, driven by emotion and ambition, takes a more aggressive stance. Their contrasting personalities and strategies create tension, but both are determined to uncover Kira's true identity. Light, now supported by the Shinigami Ryuk, manipulates the task force and his allies, including Misa Amane, to maintain his position and eliminate threats. The story intensifies as Near and Mello independently gather evidence, leading to a high-stakes confrontation.

The narrative builds toward a climactic showdown in the Yellow Box Warehouse, where Near orchestrates a plan to expose Light as Kira. Light's meticulous schemes unravel as the task force, now aligned with Near, confronts him. The tension peaks as Light's desperation becomes evident, and his reliance on the Death Note's power is ultimately his downfall. The story concludes with Light's demise, marking the end of Kira's reign and the resolution of the battle between justice and corruption. The film encapsulates the psychological warfare, moral dilemmas, and intricate strategies that define the "Death Note" series, providing a streamlined yet comprehensive overview of its latter half.