Tay Cham's manga / #Kimetsu no Yaiba(1)

To be even though it's incest what makes me don't like this story it's not the siblings liking each other but the plot itself. It has a potential but it's badly explained. Like what happened to the rest of the family? Is he a sun breather? How did he already unlocked his mark? How strong is he in a battle against a uppermoon since he was able to face a lower moon and a hashira without effort. There are so many plot holes that the only thing that is good is the artstyle because the history was able to be WORSE than the original. Has more plot holes than the original and it doesn't make sense at all. The incest even sounds as a excuse to people pay more attention to it than the history and the plot so no one would notice since the art style is so pretty.