Steins;Gate follows a self-proclaimed mad scientist named Rintar? Okabe who, along with his friends, manage to invent a microwave that can send text messages into the past, allowing him to travel between alternate worlds.
Rintar?, Itaru, Mayuri and Ruka are invited by Rumiho to come to Los Angeles, where they reunite with Kurisu. However, things don't go exactly as planned due to Rintar?'s wild delusions, leading them to be checked into a motel. Later that night, Kurisu talks to Rintar? about the dreams she's had of past world lines. After visiting the card tournament Rumiho had entered, Rintar? spots someone that looks like Suzuha and chases after her, having a conversation that hints at her being Suzuha's future mother. However, this leaves Rintar? stranded on the highway before being eventually found by Kurisu, who becomes stranded with him. Whilst waiting to be rescued, they talk about the world line where they confessed to each other and Rintar? once again makes his confession. Kurisu responds by telling him to close his eyes, just as she did before their first kiss in another world line.
Picking up a sabre toy in order to use its liquid as a substitute for Kurisu's blood, Rintar? and Suzuha return to the day of Kurisu's death. First, Rintar? makes sure to obtain the metal toy he previously gave to Mayuri in order to prevent it from saving Kurisu's time travel theory from a fire. When Rintar? finds the liquid in the sabre had dried up, he decides to taunt Nakabachi into stabbing him before knocking out Kurisu with a taser. Letting Nakabachi escape with Kurisu's theory, Rintar? uses his own blood, screams of pain and the unconscious Kurisu to recreate the scene his past self saw. As Rintar? returns to the present, Suzuha gives her thanks before she disappears, saying that she can't stay with him. After he recovers from his wound, Rintar? starts giving out badges to the lab members he recruited in other timelines (including Moeka, who now works in Tenn?ji's shop), saving one for Suzuha, who will be born in seven years. While walking in the street, Rintar? runs into Kurisu, who was looking for him to thank him for saving her life, and the two renew their relationship.
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