One-Comma Sharingan

At night, inside Uchiha Cheng's home, he returned to his room after finishing dinner.

Having mastered all ninjutsu at an early age, he had spent the entire day practicing and consolidating what he had learned.

The progress was incredibly gratifying; it was as if he possessed innate talent. Under his control, chakra moved as easily as his own limbs, allowing him to complete even the most delicate operations with speed. This was likely one of the reasons he could learn ninjutsu so quickly.

However, no matter how vast his chakra reserves were, the drain on his physical strength and energy was real. He was exhausted, collapsing onto his bed the moment he entered the room.

Yet, remembering his mother's instructions, Uchiha Cheng let out a groan and forced himself to sit up.

He still needed to complete his cell activation training. Since it didn't require a spacious area like other ninjutsu, he had saved this practice for last.

A pale blue glow emerged from his body as Uchiha Cheng patiently channeled chakra into every part of himself, bit by bit.

This training was incredibly dull and tedious, requiring absolute focus without a single distraction.

Chakra is a mixture of spiritual and physical energy; losing focus often leads to a disturbance in spiritual energy, causing the chakra to dissipate.

A ninja must constantly endure this monotony, practicing over long periods to improve their abilities.

At this moment, Uchiha Cheng began to understand the meaning of being a ninja.

A so-called ninja is one who can endure. Enduring boredom, enduring pain.

As time gradually slipped away, he felt vitality surging back into his fatigued body; the process of cell activation was alleviating his exhaustion.

However, his eyes, which were constantly receiving the influx of chakra, began to feel strange.

At first, it was just a slight itch, but later, it felt like a fetal movement.

As the master of his own eyes, he could clearly sense the hunger radiating from them. It was a feeling similar to being hungry and wanting to eat, and the message his eyes were sending him was clear: they needed chakra.

Uchiha Cheng decided to heed the needs of his body. He continuously channeled chakra into his eyes. Yet, his eyes were like a bottomless pit; no matter how much chakra he poured in, they swallowed it all in one gulp.

He paused his cell activation training to supply his eyes with his full focus.

Relying on his own bottomless reserves of chakra, Uchiha Cheng satisfied the needs of his eyes.

Only after consuming an amount of chakra equivalent to what Uchiha Cheng had expended throughout the entire day did his eyes finally signal that they were full and satisfied.

Uchiha Cheng could clearly feel that his eyes had grown. Moreover, a new power had been born.

Could it be that the Six Paths ninjutsu of the Rinnegan have awakened? he wondered to himself.

He attempted to mobilize this newly awakened power, and his vision suddenly turned blood-red, as if he were wearing red-tinted glasses; everything he saw was stained in crimson.

Could this be...

Uchiha Cheng opened the cabinet beside his bed, took out a small mirror, and held it up to his eyes.

Reflected in the mirror was a blood-red pupil marked with a single pitch-black tomoe.

One-Tomoe Sharingan!!