Lavinia was framed by her beloved father and labeled a villainous young lady. To raise funds for her revenge, she chose Hotel Alheim, a converted Demon King's castle. She tried to seduce the handsome young general manager, Ruudbert, a descendant of the Demon King, and seize management rights, but her attempt failed quickly. However, Lavinia, who aims to rise to power, uses her "knowledge of evil" to solve the problems of guests one after another. A tale of ambition and humanity unfolds at the Demon King's hotel! (Source: Kadokawa, translated)

1. Invisible Granny: All Kaidan No.9: 1999/5 2. Face Sellers: All Kaidan No.10: 1999/7 3. Face Sellers 2: All Kaidan No.11: 1999/9 4. Poisoned Girl: All Kaidan No.6: 1998/11 5. Decapitation Loving Lady Doctor: All Kaidan No.13: 1999/12 6. Trauma Teacher: All Kaidan No.14: 2000/3 7. Hysterical Nurse: All Kaidan No.15: 2000/5 8. Machete Man: All Kaidan No.16: 2000/7 9. Jimpi's Neck: Super Horror Vol.4: 20001/3

Karen, a young girl who entered the harem, attracted by the prospect of a life with three meals a day and a nap included, ends up taking a liking to the emperor, Tenrin, through a series of unexpected events. Karen pursues her hobbies while dodging Tenrin's advances, but while strolling around town with Tenrin, she ends up helping a foreign student, Makana, who has been caught up in some trouble. Apparently, he is being chased by police because he has a blueprint of the harem that he has no recollection of possessing. Karen tries to uncover the truth using her natural imagination, but...!? (Source: Shueisha, translated)