Earth Gate (The Gate Trilogy Book III)
ーThe Return to the Sea
Every river, in time, returns to the sea.ー
It is the oldest law written into the fabric of nature.
If the Moon was a vault to lock away the memory of beginnings, and Mars was the soil that allowed things to age, then the oceans of Earth are perhaps the final shore—the single destination where every traveler must eventually return.
Prologue
In the winter of 2028, I received that familiar, small parcel once again. Inside was a single piece of sea glass, milky white and worn smooth by the eternal friction of the waves. Accompanying it was a brief, handwritten note: Found on the coast of the Boso Peninsula, Chiba.
Even before setting it inside the molecular analyzer, I already knew. The moment it rested in my palm, a faint, intimately familiar crest materialized at the molecular level upon its frosted surface.
"Let us meet on Earth. Where there is an ocean, there is no longer any need to depart."
The Moon was a place to be felt. Mars was a place to be touched. And Earth—Earth was "the place where one no longer has to leave."
Two long, scattered threads of history were finally converging upon a single shore. That was the unmistakable premonition I felt.
Chapter I: The Gate of Return
Where the lunar sub-surface voids were absolute vacuums, and the subterranean caverns of Mars held only a ghost of an atmosphere, Earth possessed something entirely different—the ocean.
The colossal "temporal kinetic energy" generated during chronal displacement remains perfectly preserved in a vacuum (the Moon) and diffuses at a glacial pace through thin atmosphere (Mars). However, when submerged in a medium as dense as water, that energy is absorbed—quietly, but completely.
At the absolute floor of Earth’s deepest oceanic trenches, where light never penetrates, and where temperature and hydrostatic pressure have remained virtually unchanged for millennia, lies a stillness. It is a profound quietude that rivals the vacuum of the Moon, yet it is manifested through the sheer, crushing fullness of water.
Future generations called this place the "Gate of Return." Those who pass through it once forfeit the power to ever skip across the timeline again. It was a one-way transit—the final voyage.
Chapter II: Forty-Two Years
At the Mars Gate, Ren and Luna spent forty-two years together.
Upon the rust-red soil of the Martian plains, they had constructed a small, two-person observation outpost. By the window, a single flower brought from Earth grew with slow, deliberate grace in the planet's weak gravity.
Forty-two years. It was the first time in either of their lives that they possessed a "continuous block of time"—a stretch of existence that belonged entirely to them, stolen from no one. Yet, even that stolen time was drawing to a close.
"Ren, Luna. The temporal energy accumulated within your cellular structures has reached its critical threshold."
The voice of the commander on the comm-monitor stated the unvarnished facts with clinical detachment.
"If you maintain further contact with the spacetime matrix, your very existences will be registered as anomalies—localized distortions in the timeline. Return is officially mandated."
Chapter III: The Final Insignia
To return meant to pass through the deep-sea gate of Earth and deposit the entirety of their chronal abilities at the bottom of the ocean.
What awaited them on the other side was a life lived as ordinary human beings, stripped of certain memories. They would simply "manifest" as an aging man and woman on some quiet, forgotten shore.
"The voids of the Moon... these forty-two years on Mars... will we truly forget all of it?" Ren asked.
Luna offered a quiet, serene smile.
"Even if we forget, it doesn't mean it vanishes. Our heartbeats are still sleeping within the Moon. The Martian winds will continue to carry our footprints across the red dust. And now—the ocean will carry our 'hereafter'."
Before they left, they carved one last mark into the crimson Martian bedrock. Following the insignia for "Reunion" on the Moon, and "Touch" on Mars, they inscribed a third glyph. In the language of the future, it signified: To Return Home.
Chapter IV: Descent Into the Abyss
The Gate of Return lay in the absolute dark of Earth's deepest trench, far beyond the reach of the sun.
The small atmospheric capsule carrying Ren and Luna drifted downward through the ink-black water, guided by lines of pale blue luminescence—the exact same hue they had seen so many times within the lunar voids.
As the hydrostatic pressure gauges climbed, the faint, shimmering light that enveloped their bodies—the chronological energy required to pierce spacetime—began to unspool, dissolving outward into the water like falling snow.
The remnants of that light, preserved on the Moon and weathered on Mars, dissolved into the deep-sea currents, transforming into the bioluminescent glow of countless abyssal organisms, scattering silently into the dark.
"Look, Luna. Our time... it's turning into light in the ocean."
Luna gripped Ren’s hand tightly. As the sensation of her memories fading washed over her, the last thing she anchored herself to was the simple, undeniable warmth of his palm.
Chapter V: The Strangers on the Shore
That winter, a quiet stir rippled through a small fishing village on the Boso Peninsula.
In the early hours of the morning, an old fisherman heading out to sea discovered an elderly couple collapsed on the sandy beach. Though weak and emaciated, their lives were in no danger. Strangely, no identification or record of their existence could be found anywhere.
The rescued couple seemed to remember almost nothing, save for their own names. Yet, the image of the two of them standing side-by-side each evening, staring out at the ocean and tracking the night sky, became permanently etched into the village folklore.
"They're an odd pair," the locals would whisper. "First they look up at the Moon. Then they look down toward that low, rusty-red star. And then, they look at the sea. Always in that exact order, like they're closing a loop."
Chapter VI: The Nameless Years
I first learned of this account in 2028, some time after receiving the parcel containing the sea glass.
It was a tiny, obscure article buried in the corner of a local newspaper, reporting on an elderly couple of unknown origin living peacefully in a Boso fishing village. When I read it, for reasons I couldn't entirely explain, the tears wouldn't stop.
I chose not to visit them. I feared that by meeting them, this chronicle would cease to be a "story" and become something too fragile to touch.
Instead, I traveled to the coast of that village and searched for a vantage point where I could simultaneously take in the Moon, the crimson spark of Mars, and the rising and falling of the tide.
As I stood there in the salt air, I could have sworn I felt a familiar, rhythmic heartbeat echoing through the wind.
Epilogue: Three Dimensions of Space
The Moon was where they found each other. Even without air, they could feel one another's presence.
Mars was where they aged together. Because there was wind, they could touch.
And the oceans of Earth were where they returned. Because there are waves, they would never have to be parted again.
Those who had spent lifetimes watching over the cosmos had finally become the ones watched over.
Tonight, the Moon shows only its familiar face to the Earth. Mars radiates its quiet, crimson light. And the oceans of Earth, dissolving two distinct lifetimes into the ebb and flow of the tide, gently wash against the shore.
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Afterword
Having compiled this final, third volume, three distinct artifacts now rest upon my desk.
A piece of lunar brass. A fragment of Martian iron. And the sea glass found on the Boso coast.
Cold metal. Coarse iron. And a rounded, gentle piece of glass polished by the endless sea.
Each fragment serves as a testament to two people who lived through distinct epochs, in distinct worlds.
When night falls and I stand by the shore, I still find myself looking at three things in succession: the silver Moon, the red eye of Mars, and the black, silent expanse of the sea.
If Ren and Luna are truly living out their days somewhere along this coastline, then surely, they are looking at the exact same view tonight.
To have a place to return to.
Perhaps that is the only true, unshakeable happiness, no matter which era of time you happen to inhabit.
