Winter has come, and Princess Syalis will do anything to stay warm, including creating a DIY magical device (known as a “Ko-tatsu”), knitting woolen underwear and trying to convince the castle blacksmith to make her a window to keep out the drafts. When she accidentally dies yet again—along with Stamper Cat—curious resurrection complications ensue. Then it’s Christmas and New Year’s! Who will the Demon King designate as naughty or nice? And will all of the other demons let poor Syalis join in any demon games...? And now the Demon King has insomnia! -- VIZ Media

The prestigious Royal Demon Academy needs to be inspected, but who is best suited for the job when former Demon King Midnight has, so to speak, shrunk from the task? Not the ones who end up going! In metafictional rather than supernatural news, when the gang finds out an anime is being made of Sleepy Princess in the Demon Castle, they all vie for a starring role. Unfortunately, watching the show when it airs turns out to be a major challenge. Worse, when Syalis doesn’t get resurrected in a timely manner after one of her little “accidents,” she turns into...Zombie Princess! -- VIZ Media

While waiting to be rescued, Princess Syalis makes herself at home by commandeering a bathtub, befriending (sort of) a cute demon girl and participating in a castle fitness challenge. Her plots to get some shut-eye include stealing ice from Ice Demons to cool off on a hot summer night, attempting to make her own waterbed, toying with magic spells and provoking an enchanted flower into releasing a soporific. And then the nightmares begin... -- VIZ Media

When things seem too peaceful in the Demon Castle, the demons investigate and find the princess in a literal bind. Having stolen a gizmo to create alternate dimensions, Princess Syalis uses it to do good in the world. Just kidding! Of course she uses it for her own (and the Teddy Demons’) selfish gain. Then, a lightning storm reveals one demon is (predictably) even more frightened of thunder than the princess. Quilladillo goes home for vacation only to discover he has a stowaway in his trunk, but it’s not the princess. Just kidding! Of course it is. And then a relative of the princess appears at the castle! What are the demon hostage takers to do...?! -- VIZ Media

Princess Syalis manages to mess up Christmas and Valentine’s Day...again. Then, when Syalis and her demon captors pay a visit to her kingdom of Goodereste, a demon stands in for the princess...and winds up needing to be kidnapped herself! A common enemy forces Syalis and her archnemesis Poseidon to team up. And Syalis messes up more things, including a Demon Castle hot pot party and a Demon King educational biopic. But she still manages to find some good opportunities for relaxing naps... -- VIZ Media

When Teddy Demon gets into a kerfuffle with Eggplant Seal, the cuteness is un-bear-able. But then Teddy Demon gets lost and is rescued by...the hero Dawner’s inept rescue party?! Meanwhile, Quilladillo’s fitness regimen doesn’t come without its drawbacks...for the princess. Plus, brothers Poseidon and Hades bond over a common weakness, Midnight finds a new prime suspect to blame for shrinking him, and Great Red Siberian sheds! -- VIZ Media

When the Demon Castle collapses (unbelievably, not due to the actions of the usual suspect), its staff and “guest” go glamping in the surrounding environs. Rebuilding is taking too long, however, so Demon King Twilight resorts to drastic measures! Now everyone is afraid of him—except for one resident who still sees him as he truly is. Plus, the princess tries to unveil Fire Venom Dragon, grimoire Alazif finally finds someone to appreciate him, and the hero actually makes some progress! -- VIZ Media