This book is also called "Starting as a Fire Moth Soldier". It tells the story of the protagonist Lin from his student days when he talked and laughed with Kevin to joining the Fire Moth to fight for humanity, and from a small soldier to a hero of humanity. It makes people feel that such a great power is hidden in a small Fire Moth. He drives a Titan, kills the Herrscher, collects concubines, becomes a hero, and reaches the peak of his life...