[Currently, volumes 1-3 are on sale from Earth Star Larna, with volume 4 set to release on December 2. Manga adaptation also decided!] Suddenly, the ground beneath me lit up, and I found myself in an unfamiliar place. It seems I was summoned to this different world along with my classmate, who is a holy maiden. Moreover, because I was considered a 'bonus,' I was treated carelessly. I can't trust this country. 'Are you okay?' '...Koutei?' 'It means the younger brother of the Emperor.' As the fiancée of the Imperial Prince, I am taken to the empire. This is a story where I, who thought I was just a side character, turned out to be more than just a side character. There are few heroic moments, and the story follows a convenient flow, so please read it with a light heart. The main story concluded on September 28, 2022. The epilogue concluded on October 30, 2022.