The Last Window
A science-fiction interactive drama

The Last
WindowSeven Days of Light

The artificial sun has seven days of power left. Divide the remaining light, investigate a buried truth, and decide what Lumen-9 becomes before the final dawn.

Explore the gameEnter Lumen-9
7Days
5Districts
5Endings
1Last light
2187 · Lumen-9

No choice leaves the city unchanged.

“The machine can keep a schedule. It cannot decide who deserves the light.”

You are the new Daykeeper of an underground city built around a failing artificial sun. Each morning brings urgent requests. Each evening demands an explanation. Between them, you decide which districts receive light—and which futures must wait in darkness.

Inspect sealed rooms, recover altered records, earn or lose the trust of four sharply different allies, and choose whether humanity’s future lies in repairing the sun or opening the gate above.

Your seven-day mandate

Allocate. Investigate. Answer.

Divide the light

Spend a limited supply of Light Units across Residential, Medical, Greenhouse, Industrial, and the Surface Gate. Every allocation changes the city’s resources and relationships.

Follow the evidence

Search detailed districts for reports, samples, damaged components, and traces left by the missing Daykeeper. Evidence can reveal choices that would otherwise remain hidden.

Own the consequences

Make public reports, face a citywide vote, permanently close a vital facility, and commit to a final plan. Five endings reflect the full timeline—not a single final button.

Inside the city

Seven days between survival and dawn.

Real in-game screens from the English release.

Lead Lumen-9 through its final week.
SEVEN DAYS. ONE LAST LIGHT.Lead Lumen-9 through its final week.
Unlock chapters and revisit the choices that shaped the city.
A COMPLETE SEVEN-DAY STORYUnlock chapters and revisit the choices that shaped the city.
Balance energy, trust, food, stability, and the surface.
EVERY LIGHT UNIT HAS A COSTBalance energy, trust, food, stability, and the surface.
Your allies remember what you protect—and what you sacrifice.
CHOICES SHAPE EVERY RELATIONSHIPYour allies remember what you protect—and what you sacrifice.
Five endings. No perfect answer.
YOUR DECISIONS DEFINE THE DAWNFive endings. No perfect answer.
The final window

There is no perfect answer.

There is only the city you shaped, the people who still trust you, and seventeen minutes of possible sky.

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