Ore no Isekai Shimai ga Jichou Shinai!

"Live free and be happy." These were the last words of Amemiya Yuya's sister before she passed away from a serious illness. Despite her wishes, Yuya, who suffered from the same disease, was destined to end his short life without fulfilling his promise. However, for reasons unknown, Yuya found himself suddenly reborn in another world. Overwhelmed by his new reality, he begins his new life as the second son of a count. One day, Yuya starts to wonder if his younger sister might have also been reincarnated in this new world, just like him. In this world, there are several females in his life—a sister, a young fiancée, a slave, a maid—but one of them could be his own sister! Original Raws.