Konoha Satou spent her teens writing The Dark History, a self-indulgent fantasy romance starring a beloved heroine who shares her name. Ten years later, an accident drops the adult Konoha into that very story, not as the heroine but as Iana Magnolia, the heroine's villainous younger sister, written to die early. Remembering every twist she once penned, Iana has to break her own death flags while her ice-cold butler Sol Nemophila, a character she designed to be her killer, watches her every move.