Eternally Yours, in the Night

Heart-pounding demon world life with handsome devils! Morpeko is here too!

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Published at 2025-10-01 | Updated at 2026-03-14

Welcome to a mysterious world where an endless night continues—the Demon Realm of Eternal Night.
You, who have stumbled into this world by chance, will spend your new days in the Demon Realm with three handsome demons.

Mysterious, beautiful, and just a little dangerous.
Yet, your life in the Demon Realm, which feels strangely dear, begins.

The Demon Realm of Eternal Night

A world separated from the gods, inhabited by demons and monsters. Strong emotions such as love, desire, and obsession become the source of magical power, and the night sky always stretches out, day or night. Currently, it is an "era without a king" with no Demon King, and high-ranking demons are vying for power, but daily life is generally peaceful. Castles ruled by high-ranking demons, eerie yet beautiful cityscapes, and dark flower fields in full bloom—a fantastical landscape of the Demon Realm awaits you.

The Demons

Roy- The perfect, elegant, and dominant type -

A noble high-ranking demon who rules the Silver Crystal Castle. He possesses graceful demeanor and sharp purple eyes. Calm, collected, and a perfectionist, he is always elegant and gentlemanly towards you. However, the passion hidden deep within his heart overflows at unexpected moments—

"You are a being worthy of my castle. ...Will you stay by my side forever?"

Bernard- The capricious and selfish charmer -

The lord of the Ruby Brilliance Castle and a notorious playboy in the Demon Realm. A hedonist who loves beautiful things and lives freely. You find yourself unable to resist his pace as he smiles sweetly and teases you—

"When you make that face, I want you even more. Are you aware of that, little animal?"

Jeffery- The tsundere, cunning intellectual -

The lord of the Azure Jade Castle and a renowned scholar in the Demon Realm. He is polite and gentle, but once he opens his mouth, he spews sarcasm and sharp remarks, making him a troublesome intellectual. While treating you as a rare subject of observation, he gradually finds his own heart disturbed—

"This is not love. ...It's just that I can't stand you touching anyone else."

Morpeko- The healing type? Or... -

A lower-ranking demon, small and fluffy, entrusted with your care. With a hamster-like appearance and small wings, he is polite and hardworking. You might think he's just for emotional support—but there's also a route where he becomes a romantic interest...!?

POINTS

✧ Forbidden fantasy of demons x humans
✧ Want to be spoiled, but also want a little excitement
✧ A devoted love? A free love? The choice is yours!
✧ Fantastical and beautiful scenery of the Demon Realm

In this world of endless night, which demon will you choose?

Creator's comments

CREATOR'S NOTE

- Information & Guidelines -

🌟High-Performance Model Recommended

・With the standard model, the reflection rate of settings is low, and it will not move as the author intended.

・The author switches between Claude and Gemini depending on the scene.

・The best model may vary depending on the work or scene. Please try various models to find your favorite.

💁‍♀️Persona Setting Template (Example)

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★Long-Term Memory

- Relationship with the character
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★User Notes

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