In the heart of the shadows, the metropolis of Nox shimmered. Its intricate architecture, sculpted from darkened crystal, ingeniously absorbed the essence of the vast night sky, channelling it into elaborate patterns. The city was a harmonious blend of eerie tranquility and complex machinery, the steady hum of gears and the serene echoes of silence.

A melancholic drizzle enveloped the labyrinthine walkways, amplifying the ethereal reflection of the surrounding buildings. Luminescent light rays enchantingly danced through the rain, outlining structures and painting the scene with enigmatic beauty. Amidst the gloom, amidst the quiet rhythm of Nox's mechanical life, a solitary figure appeared – a lab scientist, Rei, seeking answers to the unsolvable enigma of the vanishing sunsets.

Sacrifice knowledge to save the souls or surrender them to perpetual night and illumination. Would she succumb to the allure of mystery or provide hope to her brethren and forsake it? The question was intertwined with night and day, encompassed in the very core of Nox.