For Hugo, being transported to the world of Harry Potter, a novel he had read in his past life, means facing a new identity, new knowledge, and a magical world on the brink of war. Worse still, his identity makes it impossible for him to escape. Luckily, he knows the plot and how his future should unfold. Even better, he discovers he has obtained an ancient warship girl game from his past life's phone as a golden finger, allowing him not only to strengthen himself but also to summon those warship girls to his side.