The Idea of Three Parallel Worldlines
Episode 03 “The Idea of Three Parallel Worldlines”
Future Gadget Lab Devlog — Building Gadget No.6, the Steins Gate Simulator
Published: May 22 (Fri), 2026 ／ JST 07:00
Three arrows were drawn on the whiteboard
The day after the roundtable settled the philosophy.
The director and the engineer stood together in front of the lab’s whiteboard.
“Gadget No.6 observes multiple Worldlines, simultaneously.”
“Yappy. How do we build that?”
First, a single arrow was drawn from “Now” toward “5 years later” — a straight line.
Next, a second arrow appeared beside it.
Then a third — at a slightly different angle, pointing toward another future.
Three arrows. Three futures you might choose.
Why three?
The analyst arrived at the desk and placed a memo on it.
“Senpai, cognitive science says it. The number of options a human can compare at once tops out at three or four. Too many breaks the comparison; too few makes the divergence meaningless. Three is the sweet spot.”
The three arrows on the whiteboard were thus fixed as the “three parallel Worldlines.”
What each Worldline needs
The engineer added items beneath each arrow.
- Input: an ideal future five years from now (free text or template)
- Milestones: 5–7 key branch points per Worldline, laid out on a timeline
- Cost: resources consumed — time, money, relationships
- Probability: how reachable that Worldline is
- Fit Score: how well it matches you (referencing data from Gadgets No.1–5)
Each of the three arrows became a comparable object across five axes.
The Integrated View — that is the core of Gadget No.6
Even when three Worldlines are visible, the one who chooses is the user.
So Gadget No.6 carries one more function: “compare the three, and present a recommended route along with its rationale.”
“That is the role of an organization tool. We do not decide. We only make it visible.”
The director’s words sealed the core concept of Gadget No.6.
The night before the code name was decided
Looking at the whiteboard, the director quietly said:
“Three Worldlines — there is a fitting name for that.”
A single memo was left in the lab that night:
STEINS GATE SIMULATOR
Tomorrow, Gadget No.6 will receive a name fixed into a Worldline.
Next Episode
Episode 04 “The Day We Named It ‘Steins Gate’” — Tomorrow morning at 7:00 JST.
Why “Steins Gate”?
The lab members will speak of why the Worldline concept was carried into the future gadgets.
Existing Lineup
The five existing gadgets are on sale at Coconala.
- Search “Ruruo / Future Gadget” on Coconala (Japanese marketplace)
- Full episode list: ruruob.com/serial/en/
- Japanese edition: 日本語版
© Ruruob ／ Future Gadget Laboratory ／ #FGL-Devlog ／ Episode 03
**EL PSY KONG
WORLDLINE OBSERVATION / EP03
Which parallel worldline?Your vote rewrites the opening of the next episode.
▼ If you stop reading here
From Ep.03 alone, you became an observer who witnessed the idea of three parallel worldlines. Whether you continue or pause here is the observer’s choice.
If it resonated:
- Tweet your thought with #FGLDevlog
- Pin this article on Pinterest
- Ep.04 ‘The Day We Crowned It Steins;Gate’ lands on the beta worldline tomorrow at 7am JST. Come back if curious.
Every observer shifts the worldline. Thank you for observing.
▼ Existing Lineup
The five existing gadgets and the integrated set are on sale at Coconala (JP).
- Search “Ruruo / Future Gadget” on Coconala
- All episodes: serial top
- Japanese: 日本語版
— ruruo, the operator of ruruob.com
米国Amazon物販を日本人視点で。為替・関税・輸入手間を込みで考えるレビューを継続しています。 / Reviewing US Amazon products from a Japanese consumer's perspective.
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