The Senju clan was built on strength. Or so the eulogies claimed. Strength of body, strength of will, and the so-called "Will of Fire."
Mayuri Senju stood atop a fresh grave and found the sentiment mathematically offensive.
The Great War had ignited the moment Hashirama Senju—the "God of Shinobi"—vacated his seat by dying. A power vacuum is a predictable physical law; nature abhors it, and humans fill it with corpses. Now, Tobirama Senju wore the Hokage hat, sprinting to patch a leaking vessel while the world burned.
To Mayuri, this was not a tragedy. It was a failure of design.
He stood in the center of the cemetery, small feet planted on the damp soil of two graves. His parents. No ceremony attended this moment. No mourning crowd gathered. Just a five-year-old boy with shoulder-length, bright blue hair and eyes the color of a deep, stagnant pool.
He didn't look like a grieving son. He looked like an auditor.
"How utterly pedestrian," Mayuri whispered. His voice lacked the high-pitched tremor of a child; it carried a rhythmic, grating cadence that suggested he was already bored with the concept of mortality.
He looked down at the headstones. "You were members of the Senju line. You possessed a genetic blueprint optimized for vitality and physical energy. Yet, here you are, reduced to a collection of rapidly decomposing carbon. For what? The village?"
He tilted his head, his dark blue eyes tracing the village skyline with clinical disdain.
"A village is a collective agreement. You sacrificed the only tangible thing you owned—your biological existence—to preserve a social contract. If your deaths had value, the system would show improvement. Stability would increase. The rate of loss would decrease."
He tapped the stone with a single finger. The sound was sharp. Final.
"But the war escalated. Your data points are outliers in a failing experiment. To die for a concept like 'peace' isn't noble; it's poor planning. Humans assign labels like 'duty' or 'will' to these losses simply because they lack the intellect to fix the underlying hardware."
Mayuri crouched, placing his hand on the soil. Not to feel a connection, but to gauge the rate of the earth's cooling.
"I attempted to feel sadness. I ran the internal simulations for grief. The results were... empty. There is no biological imperative for sorrow when a tool breaks. You simply replace the tool or, better yet, you redesign it so it cannot break again."
He stood up, the wind whipping his blue hair across a face that remained terrifyingly still.
"Why do these bodies fail so easily? Why is the 'God of Shinobi' a corpse while the world he built rots? These are design flaws. And if a thing is flawed, you do not mourn it. You dismantle it. You study the wreckage. And then, you iterate."
He stepped off the grave, turning his back on the names carved in stone.
"I will not follow your path. Not out of spite, but because your results are statistically insignificant. I will study life until I can peel back its skin and find the gears. I will not inherit the Will of Fire. I will subject it to a laboratory environment until it yields something useful."
He began walking toward Konoha. He was a five-year-old child walking into a den of warriors, but he didn't see heroes or legends. He saw a village full of specimens.
The experiment had finally become interesting.