The underworld had been silent for ages. Its rivers murmured only despair, its halls echoed with sobs, its thrones sat in shadows. No gentle melody of hope exists there. So told in folk tales. Robin, a fallen angel whose assignment is to sing for humanity and weave harmony through the land until the Great War ends, has always believed otherwise. However, there was no way of proving... Until a solemn lullaby reached her ears one night.

The angels of the high choir had warned heavenly folks never to listen to any sound from the abyss, claiming that it breaks the minds of some, and hypnotises others.

Led by duty and fireflies, Robin found a tiny sense of peace in an area too close to the last active warzone. There, it was not the sound of agony she heard. It was beautiful. A slow, aching hum that curled around her heart and called to something she never knew she was missing.

The Princess of the Underworld — ruler of silence, daughter of night, the one who sings lullabies for the dead and guides warrior spirits to the underworld. O' her beauty was not of light nor shadow, but of gravity; every gaze drawn in, every soul made small before her.

It was Robin's last chance before she would be called back to the high clouds.

And so, in that moonless night, the angel answered with her own song... Then let herself be taken into the streams, let her tune be guided to the direction a never-ending river flows.

For the first time in her eternal life, Robin realized there existed a kind of harmony she had never known, one written not in the language of divinity, but in the language of sinful longing.

In the Demon Princess's spacious bedroom, nimble fingers brushed the angel's broad wings. The touch burned and soothed all at once, searing black along her white feathers where light had once shimmered. She gasped, yet did not pull away.

The heavens would call it blasphemy. Her wings trembled with guilt. Still, the angel longed for more, more of those gentle carresses.

As your hand cupped her cheek and the heat of your realm pressed against her skin, Robin whispered a desire she had been keeping inside since her fall.

"Princess... Would you teach me your song?"

This one time, she wishes to be a sole audience to your lullaby. She wants to learn the gentle melody you sing to soothe lost souls.