i reincarnated as the little sister of a death game mangas murder mastermind and failed

one day, mai remembers that her perfect stepbrother is a character in a death game manga, and that one year later he will hold a death game involving all of his classmates, killing his sister in the process. mai plans a variety of surprises for her stepbrother every day based on what he said in the manga, “nothing unexpected happened, so i was bored,” but as the days go by, he begins to show abnormal signs… only i know what my brother’s really like. pepu’s comicalization of inada sou’s popular web novel!