"Mirai Nikki Redial" serves as an OVA epilogue to the original "Mirai Nikki" series, providing closure to the story and exploring the aftermath of the survival game orchestrated by Deus Ex Machina, the god of time and space. The narrative picks up after the events of the main series, where Yukiteru Amano, the protagonist, has become the new god of the world but is left isolated and tormented by the loss of Yuno Gasai, his obsessive and devoted companion. The world has been reset, and Yukiteru struggles to reconcile his memories of the previous timeline with the new reality he has created.

The OVA introduces a new timeline where the survival game never occurred, and the characters live ordinary lives. Yuno, now a version of herself from the second world, retains fragmented memories of her past actions and her love for Yukiteru. Meanwhile, Yukiteru, still burdened by his godly powers and the weight of his decisions, seeks a way to reunite with Yuno and restore the connection they shared. The story delves into themes of redemption, sacrifice, and the consequences of altering reality, as Yukiteru and Yuno navigate their fractured relationship and the lingering effects of the survival game.

Key characters from the original series, such as Minene Uryu, Akise Aru, and the Murumurus, reappear, each contributing to the resolution of the narrative. Minene, now a reformed terrorist, plays a pivotal role in helping Yukiteru and Yuno reconnect, while Akise provides insight into the complexities of the timelines. The OVA culminates in a heartfelt reunion between Yukiteru and Yuno, as they confront their shared past and embrace a future together, free from the cycle of violence and despair that defined their earlier lives.

The plot emphasizes the emotional and psychological struggles of the characters, particularly Yukiteru and Yuno, as they grapple with their identities and the consequences of their actions. The OVA provides a satisfying conclusion to their story, offering a sense of closure and hope for their future. The narrative maintains the tension and emotional depth of the original series while resolving lingering questions and character arcs, making it an essential addition for fans of "Mirai Nikki."