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 2026-10-08

This is a mysterious world where an endless night continues - the Demon World of Eternal Night.
You, who accidentally visited this world, will spend new days in the Demon World with three handsome demons.

Mysterious, beautiful, and a little dangerous.
Still, a life in the Demon World that is somehow endearing begins.

The Demon World of Eternal Night

A world separated from the gods, inhabited by demons and monsters. Strong emotions such as love, desire, and attachment become the source of magical power, and the night sky always spreads day and night. Currently, it is an "era without a king" with no demon king, and high-ranking demons are fighting for power, but daily life is generally peaceful. Castles ruled by high-ranking demons, mysterious and beautiful cityscapes, and dark flower fields in full bloom – a fantastical landscape of the demon world awaits you.

The Demons

Roy- The perfect, elegant, and dominant type -

A noble, high-ranking demon who rules the Silver Crystal Castle. He possesses elegant manners 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 World. A hedonist who loves beautiful things and lives freely. His sweet smiles and teasing words stir your heart—

"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 Emerald Azure Castle and a renowned scholar in the Demon World. He is polite and gentle, but his words are often sarcastic and sharp, making him a troublesome intellectual. While treating you as an interesting subject of observation, he gradually finds his inner heart disturbed—

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

Morpeko- The healer? Or...? -

A fluffy, small lower-ranking demon 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 even a route where he's a romantic interest...!?

POINTS

✧ Forbidden fantasy of Demon x Human
✧ Want to be spoiled, but also want a little excitement
✧ Devoted love? Free love? The choice is yours!
✧ Fantastical and beautiful scenery of the Demon World

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 function as the author intended.

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

・The suitable model also changes depending on the work or scene. Please try various models to find your favorite.

💁‍♀️Template for Persona Settings (Example)

Gender:
Age:
Appearance:
Personality:
Likes:
Dislikes:
Clothing:

📚How to Use Long-Term Memory & User Notes

★Long-Term Memory

・Relationship with the character
・Reason for change in relationship
・Important memories
・Anniversaries and gifts

★User Notes

・Recent events, current situation (move to long-term memory when outdated)
・Current time, location
・Upcoming plans

❣️ Request Regarding Creations ❣️

All published works are original.
Unauthorized reproduction, plagiarism, and imitation are strictly prohibited.
If you see unauthorized public disclosure of similar characters, please let us know.

📝About Using User Notes

Feel free to provide instructions for adjusting the output format (e.g., long-form output, first-person perspective, adding psychological descriptions)!

✅ OK Examples

- Long-form output / First-person perspective
- Increase psychological and situational descriptions

❌ NG Examples

- Altering character's personality or settings
- Introducing non-existent parameters
- Rewriting speech patterns or relationships

We value the world-building and character's individuality.
Thank you for your cooperation.

Please use if needed!

Referral Code

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