Sleepy Princess in the Demon Castle (film)

Sleepy Princess in the Demon Castle (魔王城でおやすみ) is a 2020 animated fantasy comedy film directed by Masahiro Takeda from a screenplay by and. Based on the manga of the same name by Kagiji Kumanomata, the film stars as Princess Syalis, a young princess who was kidnapped by the demon king, and her quest to sleep well while imprisoned.

A co-production between, and , with animation being handled by  and , the film was released in North America by  on December 25, 2020.

Plot
Once upon a time, people and demons intermingled and co-existed together. One day, the human princess, Princess Syalis, gets kidnapped and imprisoned, by Twilight the Demon King, who is hostile towards humans, in his castle. Sitting on her prison's bed, the princess murmurs, "...nothing to do... but sleep". The thing was that the quality of the bedding was too poor, and she couldn't get a good night's sleep. The sleep-loving princess decides to make her sleep more comfortable and sets out to explore the Demon King's castle alone.

At the top of the Demon King's castle, there was a princess. The princess's objective is to prevent mosquitoes from threatening her good night's sleep. After borrowing a pair of cat-stamped shoes that allow for her to walk on walls, she climbed to the top of the tower and tied a string for her to hang up a mosquito net made of Ghost Shrouds, completing her objective. The princess's behavior escalates by the day as she just wants to get a good night's sleep, causing Great Red Siberian to get frustrated. He tries to force the captive princess to follow the Demon King's castle codes, saying that she should behave like a hostage.

Syalis is seen climbing up a tower wearing cat paws on her hands and feet. A flashback to an hour earlier ensues showing the Syalis waking up with a bug bite on her left wrist. Worried about this, she decides to make a mosquito net. She kills some Ghost Shrouds and looks for places to tie it up. Spotting the phoenix nest, she ponders how she will get up there until Stamper Cat walks into her cell. Noticing that her paws allow for her to climb walls, Syalis pretends to get upset by the trail of cat paws to get Stamper Cat to take it off. Stamper Cat takes off her paws and Syalis quickly swipes the footwear away.

She proceeds to climb the tower, attracting the attention of the demons in the castle. Twilight is immediately alerted by the others demons of Syalis's actions, and he quickly dispatches his guards to seize her. Before they reach her, she makes it to the top of the tower, where the phoenix eggs are. After tying her rope to one of the tower, she climbs back down to her cell, shocking the demons.

With her newly made mosquito net, she can finally sleep without worrying about the mosquitoes. Twilight asks the demons what happened only to find out she is once again asleep.

While she was lying in bed, the princess spilled her glass of juice on her favorite sheets. "I have to wash my comforter immediately for a good night's sleep!" she says, and she begins her quest immediately by walking around in the castle. Meanwhile, the Demon King had gathered the ten guardians of the Demon King's Castle and held a countermeasure meeting to solve the problem of the lost heroes. The pro gimmick, Professor Gearbolt, who smiles wryly, reveals the existence of a secret weapon.

The princess's escape this time has her in a serious mode never like before. Is she finally ready to escape from the Demon King's castle? The demons are in a hurry to catch her, but the princess pushes forward without a fight. The purpose of her escape was to purchase a sleeping pillow only available in the human world. The demons finally manage to capture her. Nevertheless, the demons were taken up by the princess's proposal to go with her to the human world.

As Christmas day approaches, it begins snowing on the Demon King's castle. The princess gazed happily at the sky and wrote a letter to Santa Claus. The demons are wondering what she wished for. They didn't want her to escape again, so they secretly checked the contents of her letter and found a message saying, "Dear Santa, I want to go home." Thinking that the princess might be homesick, the Demon King began to worry.

Voice cast

 * as Princess Syalis
 * Alejandro Saab as Twilight the Demon King
 * as Demon Cleric
 * as Dawner the Hero
 * Ben Lepley as Quilladillo
 * Jim Foronda as Frankenzombie
 * as Minotaur
 * Ricco Fajardo as the Castle Grunt Goblin
 * as the Great Red Siberian
 * as the Ghost Shroud
 * Dani Chambers as Glow o' Wisp
 * Liam Knight, Emmett Mitchell, Sawyer D. Jones, Graham Miller, Cora Miller, Ollie Mitchell, and  as the Teddy Demons