Reiketsu Ryuuou Heika no "Unmei no Tsugai" rashii Desu ga, Koukyuu ni Hikikomorou to Omoimasu

Upon reaching adulthood, Efinia, the fairy princess, is set to have an audience with the Dragon Emperor. However, as soon as she meets Emperor Glendil, it is revealed that Efinia is his "fated mate." Shocked, Efinia overhears the emperor's heartless words, "It's outrageous that someone who looks like a child is my mate." In that case, fine! I don't desire the love of an arrogant emperor! Undeterred by the harassment from other concubines, Efinia thoroughly enjoys her life in the harem. She eventually befriends a small dragon that wanders into the harem, but it seems this dragon has a secret...