That evening, as the sun dipped behind the cityscape, Riku found himself in the quiet courtyard of the Hayashi Clan town. Yuki, his twelve-year-old sister, sat cross-legged on the ground, eyes wide and determined.
"Riku," she said softly, "can you… train me? When I get older, I want to be just as strong as you."
Riku smiled warmly and crouched beside her. "You've got the spirit, Yuki."
He reached out and touched her palm, where a faint glow pulsed. The second marking appeared there — delicate, like twin blades crossing in a precise dance.
"This mark," Riku explained, "is your legacy. It's tied to your essence and potential. I'll give you a little energy to help you start feeling it."
A gentle wave of energy flowed into her, warm and steady. Yuki's eyes sparkled with newfound strength and excitement.
"Ready to begin?" Riku asked.
Yuki nodded eagerly.
Over the next hours, Riku patiently taught her the basics — controlling her aura, sensing the flow of energy, and practicing simple movements that felt like swirling currents.
The marks on their hands glowed faintly in the moonlight — symbols of the future, of power passed down and built upon.
"I'll get stronger, Riku. I promise," Yuki said with a fierce smile.
Riku nodded, pride swelling in his chest. "And I'll be here every step of the way."