《命运石之门：境界面上的缺失之环》是一部由动画工作室White Fox制作的科幻悬念电视特别篇（TV Special）。它于2015年12月3日作为重播版《命运石之门》动画的第23集（Episode 23β）播出，全称为《Steins;Gate: Kyoukaimenjou no Missing Link - Divide By Zero》。
Okabe abandons his "Hououin Kyouma" persona, returns to life as a normal college student, and begins wearing black instead of his iconic white lab coat, setting the stage for his depressed state in Steins;Gate 0
Divide By Zero is heavily praised for its somber tone and realistic depiction of psychological burnout. The second half of the episode skips forward in time, peeling away the eccentric, chuunibyou alter-ego of "Hououin Kyouma".
and send the "video mail" from the future that makes the original happy ending possible. 2. Key Differences from the Original Episode 23 Steins-Gate- Kyoukaimenjou no Missing Link - Di...
The Phantom Limb of Time: Narrative Amnesia and Existential Validation in Steins;Gate: Kyoukaimenjou no Missing Link
Steins;Gate: Kyoukaimenjou no Missing Link features a visual novel-style gameplay mechanic, where players progress through the story by interacting with characters and making choices that influence the narrative. The game includes:
Upon returning to the present radio station rooftop, completely traumatized by the blood on his hands, the story hits its fatal fork: In 23β, that message never comes
In the original Episode 23, Okabe has a breakdown but is spurred back into action by a video message from his future self. In 23β, that message never comes. As a result, Suzuha Amane is left stranded in 2010, her mission to prevent World War III doomed to failure. This sends the world spiraling down a darker path, eventually leading directly into the events of Steins;Gate 0 .
Because he is not forced to look at his phone, Okabe fails to open the "Movie Mail" containing Operation Skuld.
In the original narrative, protagonist Rintaro Okabe travels back in time to prevent the death of Kurisu Makise. His first attempt ends in a horrifying accident: he inadvertently takes her life himself. Gate 0 .
Okabe dropped the soldering iron. He picked up his phone. Deleted the unsent message. And typed a new one — not to Kurisu, but to himself:
The title "Missing Link" refers to the narrative gap between Okabe's initial failure and the "Future Okabe" who eventually sends the video D-Mail. Episode 23β establishes that the happy ending of the original series is not a lucky break, but a result of decades of suffering endured by this specific version of Okabe. Steins;Gate 0 as a Midquel : This episode serves as the direct prologue to Steins;Gate 0