GAMMA THRESHOLD
In a world divided by an uneasy ceasefire, two neighboring cities stand on opposite sides of evolution.
One city, Arcadia, is home to citizens born with abilities that defy the laws of physics—telekinesis, spatial distortion, mind influence—powers that have shifted the balance of global conflict and pushed humanity to the brink of war. The other city lives in fear, restrained by technology, diplomacy, and the knowledge that they are already falling behind.
Ren Takahashi, a quiet, analytical high-school senior from a poor family, dreams not of power but of resolution. He believes war can be ended through engineering—through a weapon or system precise enough to stop conflict without destroying the world. His life revolves around school, responsibility, and the pressure of a future he feels unprepared for.
Everything changes when Ren, along with two classmates—
Aiko Nakamura, perceptive and emotionally attuned, and
Kaito Moriyama, impulsive and fiercely protective—
are drawn into the hidden laboratory beneath their academy.
Their biology teacher, Mr. Sashimoto, reveals himself as a rogue scientist obsessed with human evolution. Through a controlled—but flawed—experiment involving gamma radiation, the three students cross a critical biological limit known as the Gamma Threshold: the point at which the human body stops rejecting change and begins adapting to it.
They do not gain powers instantly.
Instead, they gain residuals—heightened perception, unnatural clarity, unstable abilities that manifest differently in each of them. As their bodies and minds evolve, so does the danger around them.
When Arcadia detects their emergence, the conflict escalates.
New, untrained individuals begin awakening across the city. Public incidents are narrowly contained. Secrecy becomes fragile. Morality blurs as Ren is forced into leadership—not because he seeks it, but because he understands the cost of failure.
As Arcadia’s agents move in the shadows and governments circle from above, Ren must confront an impossible question:
Can humanity evolve without losing itself?
Gamma Threshold is a slow-burn action sci-fi manga about evolution, responsibility, and the terrifying truth that the greatest weapon is not power—but control.
