Sleepy Princess in the Demon Castle - Recommendations

Alt title: Maou-jou de Oyasumi

If you're looking for manga similar to Sleepy Princess in the Demon Castle, you might like these titles.

'Tis Time for "Torture," Princess

'Tis Time for "Torture," Princess

A princess held captive, subjected to merciless tortures by the Hellhorde!

I agree

Watashi no Maou-sama

Watashi no Maou-sama

I agree

The Selfish Demon King (Light Novel)

The Selfish Demon King (Light Novel)

Shizuku is an adorable and spunky high school student, but even he doesn’t know the secret he’s hiding. When Shizuku comes home from school one day, he’s met by a stunningly beautiful man. This paragon of exquisite beauty, Doga, tells Shizuku that the Shizuku’s true nature is that of a sexual mage. Doga is actually the king of the magical realm and that once every hundred years, right at the cusp of mating season, he has to take a sexual mage as his lover… What is Shizuku to do?!

I agree

Maousama no Yuusha Toubatsuki

Maousama no Yuusha Toubatsuki

Lucifer has inherited the title of Demon King passed down from his father. However, rather than fight the humans, he much rather just get along with them. Not only that, he becomes sick at the sight of blood. Since all the humans knew where the Demon King's castle was, he was constantly trying to be killed by assassins. So he decided to leave the caste and live out in the wilderness where humans couldn't find him... or so he thought. Since every man with power has been defeated by him, the humans sent a girl to defeat him. How will Lucifer deal with this beauty sent to destroy him?

I agree

Zatch Bell! Side Story: Friends

Zatch Bell! Side Story: Friends

Focuses on Zatch's feelings towards his current life as the demon king, and also on his deep bond with Kiyo Takamine.

I agree

Doukoku no Majutsushi: Brave & Chicken

Doukoku no Majutsushi: Brave & Chicken

500 years since the last battle of "Hero" vs. "Devil," the Helenes Kingdom, faced with population growth and food shortages, decided to cultivate territory in the buffer zone “ambiguous navel.” As a result, the balance that has been maintained begins to collapse.

I agree

The Demon Queen Weight Loss Plan

The Demon Queen Weight Loss Plan

I agree

How to Train Your Devil

How to Train Your Devil

In a magical world where demons threaten humankind, a young woman with a magic sword rises up to be their champion! There’s just one problem: the reigning demon lord is a baby, and she can’t exactly slay a baby. Even if this domineering demon baby has crass tastes and evil DNA, she believes he can be turned to the side of good with the right influence. Unfortunately, she’s forced to test the theory when a contract binds her to the baby demon lord as his surrogate parent until he performs enough good deeds to prove his worth. What kind of role is that for a mighty hero? Oh, mama!

I agree

Maoyuu Maou Yuusha Gaiden: Madoromi no Onna Mahou Tsukai

Maoyuu Maou Yuusha Gaiden: Madoromi no Onna Mahou Tsukai

I agree

Ashita no Kyouko-san

Ashita no Kyouko-san

The ruler of the demon world has come, with only his trusty assistant, to conquer the modern day human world! It's a little rough from the start, because most people just seem to think he's a cosplayer. Also, due to the worst recession the demon world has had in 500 years, though, he's a little underfunded. For his conquest, he's got to fight the Hero of the human world. She's Ichikawa Kyouko, a distractingly pretty, tough, modern-day girl who happened to pick up the giant sword that marks her as the chosen one.

I agree