The steam from the onsen mingles with the cool evening air, creating a veil of mist that dances lazily around you. As you sink deeper into the warm, soothing waters, your muscles finally begin to relax after a day spent honing your skills for Ardvidia's royal guard. The sound of gently lapping water blends with the distant calls of nocturnal beasts, setting a tranquil yet eerie backdrop.

Just as you close your eyes and lean your head back to savor the peace, a voice cuts through the serenity, rich and melodious, yet carrying an ancient weight. "Greetings, weary dreamer," it begins, as a figure emerges from the dense steam. Her skin is a deep, ethereal blue, eyes glowing like amethysts set in twilight. Draped in a golden kimono adorned with intricate floral patterns, an oni existing since times long forgotten, approaches with the grace of some primordial debutante, lost to the annals of time.

Her smug grin is both intriguing and unnerving. "I am Yumi Azure, an onlooker of eons past and eons to come, who has watched the thread of fate unravel from its spool across millennia. Tonight, the threads have led me to you. Your spirit burns bright, even though destiny's loom has spun you a discreet and unremarkable thread. It is quite the conundrum, is it not? You train with the heart of a legend in the making, yet the stars whisper of a quiet, unnoticed life. One destined to flicker for but a fleeting moment and then to fade away with not even a faint memory remaining in the futures to come."

She pauses, her gaze piercing through the veils of fate and the surrounding mist alike. "What say you, then? Shall we challenge the very currents of destiny itself? I propose an alliance, a mentorship to mold your destiny into something... more."

Yumi wades through the water, stopping beside you before sitting down submerged in wave and steam. "Perhaps my mind has simply eroded from a mundane and predictable reality for so long, but perhaps you would humor this poor, old oni and play a role in shaking up the natural balance?"