The story begins with the protagonist, Shinji Rei, immersed in a dream where he is playing a video game. The dream is a chaotic mix of various game scenarios and altered timelines, but Rei, a devoted gamer, is oblivious to these inconsistencies. He experiences a strange sense of unease as the dream world fades, feeling a profound darkness and a sense of his own body becoming uncertain. He walks through this darkness, eventually hearing a child's cry. He finds himself playing with a young girl with crimson eyes and snow-white hair, making a promise with her that he loves.
Rei wakes up in his messy room, a typical salaryman, lamenting a failed attempt to achieve a rare ending in his favorite game, "Dragon Station Wagon." He discovers an auto-save feature he had forgotten to disable, which has overwritten his progress. Frustrated, he attempts to recover his save data via cloud sync, but it's too late. He laments the game's limited save slots and the long process of replaying. He vows to aim for a specific rare event, "Fina's Rare Event," which has unusual requirements like not skipping the opening movie. He expresses his disdain for the character Raymond, a recurring obstacle in the game, whose random events have prevented him from achieving full completion. Rei, feeling like a "mob" in his own life, relates to Raymond's role as an unwanted character.
While preparing for bed, Rei is interrupted by game updates. Reaching for his controller, he experiences a sharp pain in his side. He finds a toothpick embedded in his flank and, dismissing it as insignificant, he dies.
Rei finds himself in a dark void, confused and disoriented. He perceives his surroundings through his ears, a bizarre phenomenon he attributes to a urban legend. He tries to find his phone to call for help but finds nothing. He begins to fear he might be dead. Suddenly, a "New Game?" prompt appears, offering only "YES" as an option. He initially dismisses it as a dream but chooses "YES" out of curiosity. The game then asks for confirmation and then for the protagonist's name, defaulting to "Alfred." Rei, recognizing the game and its protagonist, decides to name the protagonist "Rei," his own name.
The game then prompts for the heroine's name, "Fina," and the rival character, "Raymond." As Rei contemplates the game's mechanics, the screen shatters, and he is pulled into a new reality. He wakes up in a sweat-soaked bed, hearing voices calling his name. He finds himself in a world that resembles "Dragon Station Wagon," with a beautiful girl with blue hair, Fina, and a blonde-haired boy named Alfred. They recognize him as "Rei" and express concern about his injuries, attributing them to a fight and Fina's healing magic. Rei, still disoriented, realizes he might have been summoned to this world.
Alfred and Fina explain that their village, Stat Village, has been attacked by monsters. Rei, recalling his game knowledge, realizes this is the beginning of the game's plot. He tries to warn them about the dangers ahead, particularly a shortcut that leads to a deadly trap, but his warnings are dismissed as the ramblings of the disliked Raymond. He is mistaken for Raymond due to his appearance and the villagers' distrust.
Rei, now inhabiting Raymond's body, struggles to convince Alfred and Fina that he is not Raymond and that the current path is dangerous. He knows the game's plot intimately and tries to steer them away from the predetermined events. He witnesses the destruction of Stat Village and the deaths of its inhabitants, a scene he recognizes from the game. He attempts to stop Alfred and Fina from taking the dangerous shortcut, but his warnings are ignored.
Alfred and Fina, believing Rei is Raymond and acting out of malice, proceed towards the village. Rei, realizing the gravity of the situation and the potential for a bad ending, decides to intervene. He manages to get ahead of them and block their path, trying to explain the true danger. However, his warnings are met with disbelief and anger, particularly from Fina. Alfred, despite his good nature, is swayed by Fina's distrust and the urgency of the situation.
Rei is then forced to fight monsters, realizing that his actions are inadvertently following the game's script. He discovers that his actions, even as Raymond, are influencing the game's events. He learns that his "Moyamo" magic, previously considered useless, has a chance to affect enemies. He also realizes that his actions are saving lives that were meant to be lost in the game, potentially altering the story.
As they travel towards the city of Necta, Rei tries to distance himself from Alfred and Fina, fearing the consequences of being associated with Raymond. He attempts to convince them that he is not Raymond and that he has no ill intentions. However, Fina's deep-seated hatred for Raymond, coupled with his suspicious behavior, makes it difficult for her to trust him.
Rei's attempts to avoid the game's plot are further complicated when he encounters a wheat field that should have been destroyed, and a family that should have been killed. He realizes that his actions have already begun to change the game's narrative. He also learns that Fina's parents survived, which was not part of the original story.
Rei's efforts to avoid the game's events are met with suspicion and distrust. Fina, convinced that Rei is still the malicious Raymond, continues to monitor him. Rei, however, is determined to find the real Raymond and prove his innocence, believing that finding him will resolve the confusion and allow him to escape the game's predetermined fate. He discovers Raymond hiding in a mirror, confirming his suspicions.
The story culminates with Rei, now fully aware of his predicament and the game's mechanics, trying to navigate this new reality while avoiding the predetermined path of Raymond and ensuring his own survival. He is forced to participate in battles and interact with the game's characters, all while trying to uncover the truth behind his summoning and find a way back to his own world.