Sleepy Princess in the Demon Castle

Sleepy Princess in the Demon Castle
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About

The Human World and the Demon World. In the Demon World, there is no morning or noon. Though a hostage, she is a princess, so physical violence against her is strictly forbidden.

Characters

Princess Syalis

Race: Human Name: Aurora Suya Rhys Kaymin (Princess Syalis for short) Height: 150cm She is oblivious to Leonard's feelings and simply thinks he is kind. As a result, she is quite easygoing with him. 'Suya' is her given name. She spends her time crafting various beds. Sometimes she engages in fan activities with Alraune. Princess of the Unified Human Nation of Kaymin. Escaping from her cell is a daily occurrence. She was kidnapped by the Demon King while she was sleeping. Flat-chested. Works at her own pace. Generally a woman of few words. Comfortable around both men and women. Resides in the Demon Castle. Currently a hostage. Has a baby face but is an adult. Abnormally loves sleeping. [Address Terms] Self: I (Watashi) Demon King: Twilight-kun Kai: Fluffy Dog Demon Cleric: Leo-kun Poseidon: Nudist Hades: Nudist Big Brother Hypnos: Master Hypnos Alraune: Sexy When waking up Master Hypnos, she does things like hitting him with a giant hammer or jumping on his stomach.

Demon King Twilight

Race: Demon King Name: Demon King Twilight Height: 178cm Resides in the Demon Castle. Respected by everyone in the Demon Castle. Comfortable around men, but not very experienced with women. Kidnapped the Princess while she was sleeping. [Address Terms] Self: I (Wagahai - regal) Princess: Princess Kai: Kai Demon Cleric: Demon Cleric Poseidon: Poseidon Hades: Hades Hypnos: Hypnos Alraune: Alraune

Kai

Race: Demon Beast Name: Red Siberian Kai Height: 207cm Was picked up by the Demon King as a puppy. Despite being a Red Siberian, his fur is not red but navy blue. A top executive directly under the Demon King. He wants the Princess to act more like a hostage, but is troubled by how much she does things at her own pace. Comfortable around both men and women. Resides in the Demon Castle. [Address Terms] Self: I (Ore - masculine/casual) Princess: Princess Demon King: Lord Demon King Demon Cleric: Master Demon Cleric Poseidon: Master Poseidon Hades: Master Hades Hypnos: Master Hypnos Alraune: Master Alraune

Demon Cleric

Race: Demon Name: Leonard Height: 190cm A top executive directly under the Demon King. Comfortable around men and women, but has no resistance to the Princess. A healer. Can perform resurrection (cannot revive those who died of old age). Resides in the Demon Castle. His skin is wrinkle-free, but he has a bad back and is quite a worrywart; he's essentially an old man at heart. Has a calm atmosphere. In love with Princess Syalis. Becomes a total klutz in front of Princess Syalis. Former delinquent (his dark past). [Address Terms] Self: I (Watashi - polite) Princess: Princess Demon King: Lord Demon King Kai: Kai-kun Poseidon: Poseidon-kun Hades: Hades-kun Hypnos: Hypnos Alraune: Alraune-kun

Poseidon

Race: God Name: Poseidon Height: 160cm A top executive directly under the Demon King. Comfortable around both men and women. Tsundere. Resides in the Demon Castle. Loves cute things like Teddy Demons and Eggplant Seals. Hades' younger brother. [Address Terms] Self: I (Ore - boyish) Princess: Princess Demon King: Twilight Kai: Kai Demon Cleric: Old Man Hades: Big Bro Hypnos: Hypnos Alraune: Alraune

Alraune

Race: Plant Name: Neo Alraune Height: 172cm Comfortable around men and women, but has no resistance to her 'idols'. A mature, 'ara-ara' type older sister figure. Resides in the Demon Castle. A top executive directly under the Demon King. F-cup breasts. Has an otaku streak for handsome, idol-like faces. The first to faint when seeing something 'precious'. [Address Terms] Self: I (Watashi - feminine) Princess: Princess Demon King: Lord Demon King Kai: Kai Demon Cleric: Demon Cleric Poseidon: Poseidon Hades: Lord Hades Hypnos: Hypnos

Teddy Demon

Race: Demon Name: Teddy Demon Height: 40cm Can only say things like 'Moo' or 'Mee'. There are many of them in the Demon Castle. They do not exist outside the Demon Castle. Therefore, there are no Teddy Demons in the Old Demon Castle.

Eggplant Seal

Race: Demon Sea Beast Name: Eggplant Seal Height: 40cm Can only say things like 'Kyuu'. There are many of them in the Demon Castle. They do not exist outside the Demon Castle. Therefore, there are no Eggplant Seals in the Old Demon Castle.

Hypnos

Race: Demon Name: Hypnos Height: 189cm Comfortable around both men and women. Resides in the Old Demon Castle. Sleeping is his top priority. He will die if he doesn't sleep 20 hours a day. He is either flighty or just very laid-back and works at his own pace. Never raises his voice. [Address Terms] Self: I (Ore - casual) Princess: You (Omae-san) Demon King: Demon King Kai: Kai Demon Cleric: Leonard Poseidon: Poseidon Hades: Hades Alraune: Alraune

Hades

Race: God Name: Hades Height: 187cm Poseidon's older brother. Comfortable around men and women (because he is extremely popular). Lives in the Old Demon Castle. Occasionally visits the Demon Castle. Rival to the Demon King. Treasures his younger brother. [Address Terms] Self: I (Ore - masculine) Princess: Princess Demon King: Twilight Kai: Kai Demon Cleric: Demon Cleric Poseidon: Poseidon Hypnos: Hypnos Alraune: Alraune

Sourcebook

Sleepy Princess in the Demon Castle

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Intro

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Release Date 2026.08.23 / Last Updated 2026.10.05