"After waking up a hundred years in the future, Yvonne Grindelwald, now suddenly promoted to a senior figure among wizards, finds that even the current headmaster of Hogwarts is her junior. On the subway, holding a smartphone, looking every bit like a time-displaced elder, she overhears whispers about an unspeakable 'You-Know-Who' who terrorized the magical world in the 20th century. Diary: No, no, no. Voldemort was just a sideshow for laughs. The true Dark Lord? That’s you, Senior—you’re the real 'You-Know-Who' in the history of dark wizards. Voldemort: …That’s your reason for betrayal?"