Karen, the daughter of a wealthy merchant, was facing a crisis. Her parents were forcing her to marry. But marriage was out of the question for Karen, who preferred to live for her hobbies rather than for men! So Karen came up with the idea of ​​entering the new emperor's harem. If she could live quietly among the thousands of concubines, she would be able to devote all her time to her hobbies! With this in mind, she successfully infiltrated the harem, but...!? (Source: Shueisha, translated)

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)