デスゲーム漫画の黒幕殺人鬼の妹に転生して失敗した (Series) favorite_border

Volume 1 Synopsis: Mai has always idolized her perfect older stepbrother, and ever since she was little she's dreamed of marrying him someday — reasoning that since they're not blood-related, there's nothing stopping her. Then one day, she suddenly remembers something terrifying: her brother is actually a character from a death-game manga, and one year from now he will orchestrate a deadly game involving his classmates — and kill his own sister, Mai, in the process. Drawing on a line from the ma...