Summary Akuyaku Reijo no Ani ni Tenseishimashita from Zinmanga X
Akuyaku Reijo no Ani ni Tenseishimashita summary: The protagonist is confused about his sudden reincarnation as the antagonist's brother in his latest existence. Unexpectedly, he is teleported to an otome game universe where he endeavors to save his sibling from a dreadful fate.