Chapter 58: Sound Illusion 

Music drifted along a quiet river near Konoha. 

Tonbo drew another breath through the harmonica. His first attempts had produced leaking air and painfully sharp notes, but scales became stable within the hour. Individual tones began to connect, and a simple, cheerful melody followed the water beneath the trees. 

Small birds left the branches and circled his head. Several settled along his extended left arm, tilting their heads in apparent enchantment. 

Flatterers, Tonbo thought. 

He had only read the basic instructions for the instrument. Talent allowed him to reproduce a tune quickly, but no reasonable performance should captivate birds after so little practice. He rewarded them with grains from his pouch anyway. 

"Uncle Tonbo?" 

The young voice came from behind him. Tonbo lowered the harmonica and sensed several concealed figures before turning. 

Naruto stood on the bank with a fishing rod over one shoulder and a battered bucket in his hand. His clothes were worn, and a patched bag hung at his side. 

"Naruto-kun," Tonbo said. "You remember me." 

The boy's face opened into a broad grin. Being recognized seemed more important than the question itself. "You remember me too?" 

"A shinobi lives by information. How could I forget someone like you?" Tonbo tapped his forehead protector. 

Naruto stared up at it with bright blue eyes. "Shinobi are the people who jump over the roofs, right?" 

His stomach growled before Tonbo could answer. 

Naruto rubbed it and glanced toward the river. He wanted to keep talking, but hunger made the choice for him. "I have to fish." 

He rolled up his trouser legs, attached a scrap of bait to the hook, and cast from the bank. Tonbo resumed practicing nearby. 

Musical knowledge was not strictly necessary for auditory genjutsu, but previous specialists agreed that it improved control. Rhythm and melody shaped expectation, while pitch and harmony could reinforce an intended emotional response. A shinobi who understood those structures could conceal chakra within something the mind already wanted to follow. 

Tonbo practiced breath control as carefully as fingering. A broken note would interrupt both the melody and the chakra riding upon it, while an uneven exhale could make the illusion pulse strongly enough for a trained target to notice. The exercise resembled maintaining a barrier: the smallest fluctuation mattered across the entire field. 

Tonbo infused a minute amount of chakra into the vibration created by the harmonica. The sound crossed the air without affecting Naruto or the ANBU hidden around him. When the waves entered the river, however, the chakra traveled through the water and spread beneath the surface. 

Fish resting near the bottom stirred. Several experienced a sudden increase in appetite and began searching for food. 

In the shadows, a dog-masked ANBU watched Tonbo closely. "Captain, he is a shinobi approaching the Nine-Tails jinchūriki. Could he want something from the seal?" 

"Should we remove him?" another asked. 

Their silver-haired captain wore a cat mask. He looked at Naruto's small hands gripping the fishing rod and felt the familiar ache of watching the boy live alone. 

"I know Tonbo," he said. "He has no interest in exploiting Naruto. Observe, but do not interfere." 

The others restrained their instincts, though none relaxed. If Tonbo made an unexpected move, they would act regardless of his reputation. 

The captain was relieved when Tonbo returned to his music rather than approaching the child. Friendship did not remove responsibility. Naruto carried a power that Konoha could not allow anyone to manipulate, and the ANBU existed to treat every uncertainty seriously. 

The fishing line jerked. 

Naruto pulled with both hands. A fish the length of his palm broke the surface and landed on the grass. He pinned it awkwardly, transferred it to the bucket, and cast again. 

Another fish followed. Then another. 

Soon the battered bucket held more food than Naruto normally caught in an entire day. He stared at the water, puzzled. "Why are they all biting today?" 

The ANBU noticed the pattern as well. The dog-masked operative shifted closer to the bank, searching for poisoned bait or a seal beneath the surface. Their captain recognized that Tonbo was experimenting, but the target and effect remained uncertain until he saw the healthy fish struggling in Naruto's bucket. 

The harmonica sounded sweeter each time he listened. Naruto selected one of the better fish and carried it toward Tonbo with both hands. 

"Uncle Tonbo, I caught a lot. You can have this one." 

Tonbo smiled at the offer. Naruto owned very little and still chose to share the result of his good fortune. 

"You earned it. Keep it and eat well. I need to go home." 

He put away the instrument, waved, and disappeared among the trees. 

Naruto's shoulders fell. He had wanted the conversation to continue. Then he remembered that Tonbo knew his name, called him Naruto-kun, and had not looked at him with fear or disgust. The disappointment passed beneath a sunny smile. 

"Today is lucky. I will catch enough for tomorrow too." 

He cast again. 

Nothing touched the bait. 

Naruto changed positions. He tried a deeper stretch of water and replaced the bait. The fish refused to return. 

"Was it Uncle's song?" he wondered. "Next time, I'll ask him to teach me." 

Tonbo walked home while humming the melody he had practiced. Meeting Naruto had been accidental. Helping him had cost little and caused no dangerous change in the attention surrounding the boy. 

That limit mattered. Tonbo would perform quiet acts of kindness when they did not endanger Ayame or their child, but he would not turn himself into Naruto's guardian and attract the political consequences that position carried. A meal obtained through better fishing was small enough to remain harmless. 

The experiment also succeeded. His visual-genjutsu foundation translated well into sound; the intended illusion reached only the fish because he directed the chakra through water rather than the air. 

That selectivity was more valuable than attracting prey. An area technique that affected allies, civilians, and enemies equally would have limited battlefield use. If Tonbo could choose a medium or frequency that reached only intended targets, he could support a team without warning everyone nearby that genjutsu had begun. 

Auditory genjutsu used the same essential structure as visual techniques. The chakra conveyed false information to the senses, while the carrier changed. Eye contact provided precision and could deny an opponent confidence in sight. Sound offered wider range and reached targets without requiring them to look in a particular direction. 

Its weakness was warning. A suspicious melody or repeated tone could reveal the delivery method as soon as it began, giving an enemy time to block hearing or disrupt chakra. Distance Dislocation was effective because Kawasuke did not recognize the false measurement until several attacks failed. Sound would need similar concealment if Tonbo wanted more than area disruption. 

Natural noise offered possibilities: flowing water, wind in leaves, steel striking steel, footsteps, and spoken commands already belonged on a battlefield. An illusion hidden inside one of those sounds would not require a musician standing apart from the fight. The harmonica was a laboratory tool, not necessarily the final weapon. 

Konoha's archives contained surprisingly little material on the field. Tonbo suspected the lack reflected scarce musical training rather than an inherent limit of genjutsu. 

He thought of Iruka, Mibu Shinobu, and Tessen Togekei. Their promotion to chūnin should have brought progress worth measuring, and he had not seen them since before the border mission. 

Once the sound techniques became stable, Tonbo would invite his former students to practice. 

The thought made him smile. They would be delighted to help their teacher.