**Chapter 4: Guardians of Ancient Wisdom**

The rooftop garden had become a haven of training, a sanctuary where Rokotto and Yumi delved into the secrets of the past. Under the starlit sky, amidst holographic displays of energy patterns, they practiced the Kaioken technique with unwavering determination. As their bodies adapted to the ancient art, their progress became evident.

Rokotto marveled at the way his control over his energy deepened. He could feel the currents of power within him, flowing with a newfound harmony. Each time he executed the Kaioken, a surge of energy pulsed through his veins, and he could sense his physical abilities intensify.

One evening, as Rokotto and Yumi practiced side by side, a soft voice cut through the tranquility of the garden. "Impressive, young ones."

Startled, they turned to see an enigmatic figure standing at the edge of the garden. She was tall and elegant, her presence exuding an aura of ancient wisdom. Her eyes held a spark of recognition, as if she had been waiting for their arrival.

Rokotto and Yumi exchanged a glance before stepping forward. "Who are you?" Rokotto asked, a mix of curiosity and caution in his voice.

The woman's lips curved into a gentle smile. "I am Sera, a guardian of ancient knowledge. I have watched your training, and it is clear that you possess a unique connection to the past."

Yumi's eyes widened with realization. "You're the one who's been guiding us, aren't you? The one who's been helping us understand the Kaioken."

Sera nodded. "Indeed, Yumi. The Kaioken is but one of many techniques that can be harnessed to awaken dormant potential. Your dedication has impressed me, and I believe you are ready to delve deeper into the mysteries of your ancestry."

Rokotto's heart raced with a mixture of excitement and trepidation. He had spent his life immersed in the world of mechanics, but now he stood on the precipice of a journey that could reshape his destiny. "What do you mean, deeper into the mysteries?"

Sera's gaze was unwavering. "The legends speak of a lineage that carries a hidden strength, a power that transcends time. Through training, discipline, and the mastery of ancient techniques, you can unlock the full extent of your potential."

Yumi's eyes gleamed with determination. "We're willing to learn, Sera. We want to tap into that potential, to honor the legacy that came before us."

Sera's smile deepened. "Very well. Your journey has begun, and I will guide you on the path ahead. Together, we will unravel the threads of your ancestry and prepare you for the challenges that lie ahead."

And so, under the moonlit sky, Sera became a mentor to Rokotto and Yumi. She guided them through advanced training routines, teaching them to channel energy, control their emotions, and unlock their latent potential. As they delved deeper into the teachings, their connection with the past grew stronger.

Days turned into weeks, and Rokotto felt the power within him surge to new heights. His mastery of the Kaioken deepened, allowing him to access higher levels of the technique. His body became a vessel of energy, and with each training session, he felt the bond between himself and his Saiyan ancestors strengthen.

The rooftop garden, once a place of reflection, had transformed into a crucible of growth. As Rokotto and Yumi honed their abilities under Sera's watchful guidance, they realized that the past was not a distant memory, but a living legacy waiting to be embraced.

As the sun set on another day of training, Rokotto's heart swelled with a sense of purpose. The road ahead was unknown, but with Sera as their guide, he and Yumi were prepared to face whatever challenges lay ahead. The echoes of legends had become a symphony of determination, and amidst the stars that dotted the night sky, Rokotto's journey had taken an unexpected turn - a turn that would lead him to uncover the truth of his Saiyan heritage and the power that lay dormant within him.