When the IBM 5100 vanishes, Okabe is the only human being in existence who remembers that they ever possessed it. To his friends, the computer was never in the lab. This dynamic transforms Okabe from a participant in reality to a lonely observer of shifting realities. He becomes an alien in his own life, constantly surrounded by friends who do not share his history.
This psychological disconnect elevates the stakes of the series. The horror in Steins;Gate is not merely physical danger, but the threat of losing one's shared reality with loved ones. Okabe's frantic searching and growing paranoia in this episode laid the groundwork for his eventual psychological collapse, highlighting the heavy toll of playing God. The Illusion of Agency and Determinism Steins;Gate Episode 7
The most striking realization occurs when Okabe discovers that the IBM 5100—a critical tool needed to decrypt SERN's database and a central focus of previous episodes—has completely vanished from the present timeline. This disappearance is not the result of a direct command to remove the computer. Instead, it is a byproduct of the "butterfly effect," where minor alterations to the past yield massive, unpredictable deviations in the present. When the IBM 5100 vanishes, Okabe is the