The atmosphere is heavy with tension as a news report breaks through the quiet of the night. On the screen, grainy footage reveals humanoid shadow entities lurking within secret passages of the city's sewers. The reporter's voice is urgent, noting that while the public is panicked, two teenagers who allegedly "decoded the handwritten falcon" (a mysterious cipher)—seem to be the only ones who know what's really happening.
As the boy watches, the news pivots to lighter, though equally buzz-worthy, topics. The broadcast mentions Julien Blair, a popular Otaku channel on YouTube that has mysteriously stopped uploading. Just as the boy begins to process this, the news shifts again to discuss the "new popular idol" taking the world by storm: Gemi Madison. A photo of Kane alongside two other girls flashes on the screen, detailing how the young star has been "touring the world," despite her age and the mystery surrounding her sudden rise.
The boy turns away from the screen, seeking a distraction in the mundane. He heads to the kitchen, the hum of the refrigerator the only sound in the room. As he pulls out some food, a mental note (or perhaps a voiceover from the TV) reminds him of OtakuFest 2035, an upcoming event in February. The announcement teases special guests, including the duo Gemi Madison and Julien Blair, promising that more details are "coming soon."
Hungry and perhaps a bit overwhelmed by the strange news cycle, he settles down to a simple meal. He prepares a cup of instant noodles, the steam rising as he blows on the hot broth. In a moment of quiet reflection, he introduces himself:
"Hi, I'm Hydro Undergrove, and I'm 15 years old. I live in my apartment alone by myself. It's a long story how I got to be in it. I definitely depend here because I don't like living in these tiny flats." Despite his self-sufficiency, he admits with a touch of dry humor that he's "not popular as a photographer," which is why he usually doesn't have much to do other than eat and watch the world go by through his screen.
As Hydro sits in his quiet apartment, the mundane reality of his instant noodles begins to blur with something far more ancient and terrifying. He looks toward a swirling, dark vortex that seems to defy the laws of physics, a low, rumbling "RRRRRR" vibrating through the air. He notes with a calm, almost tired detachment that this phenomenon "doesn't matter anymore."
The perspective shifts away from his small room to a jagged, desolate landscape dominated by a massive, dark castle nestled between sharp mountain peaks. Hydro keeps thinking to drift back in time. While people are currently confused and terrified by the "shadow soldiers" appearing in the sewers, the truth is far more complex. Those entities aren't just a local mystery; they are a sign that something else entirely is beginning to "descend" or "awaken" from a forgotten history.
In a pocket dimension, into a sprawling cityscape where the narrator explains a grim historical turning point. This is the place where "Shadow Soldiers" reside, billions of them, comprising an army that even a god would fear. It was here that the "Decider of Legacy" once stood, before the world fell into chaos. Back then, something recounts a time when all was nearly lost; human extinction was not just a threat, but a calculated certainty. Every dimension, from the highest peaks to the lowest depths, was being systematically dismantled.
Amidst this apocalypse, humanity's "last hope" emerged: a 15-year-old child. While the youth of the world watched in terror, this lone figure faced the encroaching darkness. Hydro reflects on this history with a sense of heavy responsibility, noting that he had no choice but to step up, doing so without the world ever truly knowing the burden he carried.
Hydro delves into the nature of his abilities. He admits that he sometimes gives people "second chances," but he isn't always kind. With a cold, clinical detachedness, he describes his power as a tool for equilibrium. As a monstrous, clawed entity looms over him, Hiroto doesn't flinch. Instead, he utters a single, devastating command:
"Decimate."
In an explosion of light and shadow, the threat is vaporized. He explains that while he doesn't like to boast, his power is expansive, if he were to let it all out at once, it would likely consume everything. He isn't just fighting, he is managing a force that defies natural law.
The scale of the conflict is revealed to be even larger than a simple monster hunt. The "war against the gods" had brought fictional and legendary characters alike to their knees. The world's beloved heroes had been pulverized by a terrifying, staggering power. Everything was falling into dissipation until the "monster's they name" faced the child who was prophesied to end the war.
Hydro stands over the wreckage of his enemies, his eyes glowing behind his glasses. He isn't just a 15-year-old in a tiny flat; he is the one who forces the darkness to obey. As a final shadow lunges at him, he finsihes the blow with one final, absolute command:
"Disappear." And just like that, the threat is erased from existence.
Hydro, his eyes glowing behind his blue-tinted glasses, whispers to himself, "Hold on... just... just hold on any longer... just hold on..." It's clear that his fight isn't just for the world, but for someone specific.
The scene shifts to the Gingoog Sanitarium and Hospital on Earth-1418. There, an old woman—Hydro's grandmother—lies in a hospital bed, looking deceptively peaceful. However, the a grim reality: she has suffered from the "Eternal Sleep." She is trapped in a coma, unable to wake up unless Hydro "defeats someone." He leans over her, his voice a soft promise: "Hang in there, Grandma. I'm almost there. I just need to finish what it's done."
Returning to the front lines, Hiroto is no longer alone. He stands before a shadowy battalion, their dark forms silhouetted against the light. With an air of absolute authority, he commands them to "Rise up!" and orders the soldiers to gather. He knows the stakes are high, thinking to himself, "Everyone's going for here... I can't let this happen now."
Turning to his dark army, he gives a rallying cry:
"All of you, try to help protect everyone! No minimal or maximum damage occurs to any people here." His eyes flare with a red intensity as he prepares for the next move, declaring, "The rest of you... follow my lead. Time for a surprise attack."
Suddenly, the grand visions of war and hospitals snap back to the present. Hiroto is back in his dark apartment, and the television has gone black. He looks at the blank screen, confused. "The TV just hung turned off. I was just eating and I heard noises outside. What the hell is going on?"
Shaking off the mental fog or the "memory" he was just experiencing, he prepares to head out into the night. He stretches his arms, the sound of "STRETCH" and "STRAP" punctuating his movements as he gears up. He sighs, a bit weary of the cycle he's trapped in.
"I don't know why, I'm sleepy and all, but I'll check what's going on now. My life is a little messy." Donning his signature glasses and a high-collared jacket, he steps out of his mundane life and back into the role of the protector.
Standing on his balcony, Hydro looks out at a city descending into madness. The air is filled with the sounds of panic. He wonders to himself, "I keep hearing sirens and people screaming... Why? Is there another alien? Magic beast? No, I shouldn't overthink about that." He looks down at his quiet street, noting, "My place is completely empty, I gotta put thus room for rent, supplies are packed in my bag as well. Well then..."
Hydro hesitated for a second, "Goodbye, apartment." He said. The realization hits just as the physical world breaks. Behind him, a massive image of a hero is shattered like glass as a dark, jagged silhouette bursts through the reality of his surroundings.
There is no more time for reflection. With a deafening "CRASH!!" and a heavy "FOOM DUN," the window or perhaps the very fabric of the room explodes. Hydro doesn't hesitate. He sheds his casual demeanor, his face hardening with a soldier's focus. He leaps through the wreckage, declaring:
"Let's get back to work."
He moves with impossible speed—a blurred "SWOOSH" against the backdrop of the city skyscrapers.
The confrontation escalates instantly. Amidst the debris of a falling helicopter or vehicle, Hydro reaches out with a powerful "GRAB!" His hand clenches onto something—or someone—with immense force. The scale of the battle suddenly transcends the city streets, shifting to a cosmic perspective.
High above the atmosphere, the Earth sits cradled in the darkness of space. A massive streak of light, like a falling star or a kinetic strike, tears across the horizon. Hydro encountered another planet that is coming to crash into his. An Earth, bigger than the Jupiter. The "Decider" has returned to his work, and the world is about to witness the reason why the gods themselves once feared him.