*"Live free and be happy."* These were the last words of Amemiya Yuya's sister, who was seriously ill. Despite her wishes, however, Yuya, who was suffering from the same disease as his sister, was supposed to end his short life without fulfilling his promise. But for unknown reasons, Yuya was suddenly reborn in another world. Confused by his new life, Yuya begins his life as the second son of a count. One day, Yuya thinks about the possibility that his younger sister has been reincarnated in this other world just like him. In this world, there is a sister, a young fiancée, a slave, a maid, etc. - but one of them is his own sister! --- -  [Web Novel](https://ncode.syosetu.com/n4696dd)

True Vampires household who has the ability to transcend other races and once reigned as the ruler of the Ephenia continent! Among them, the young princess, Ristia, who has the “Strongest” power, woke up after sleeping for 1000 years and revived in a different world, that is the present day!! Her purpose isーーーwanting a cute little sister!! Even in the different world, Ristia’s ability is overwhelmingly superior and the people around her can only be astonished at how easy the job that she does… Now, can Ristia become an ordinary girl and get a cute little sisterーーー!? A fantasy story of an overwhelmingly strong vampire princess who is searching for a sister while behaving recklessly and running around noisily!