Lu Chen, an ordinary high school student, is a silent and introverted bookworm during the day, but at night he is a mysterious man in the underground world who relies on his unpredictable gambling skills and is known as the "Tengu" by his peers. On the night of his 18th birthday, in a life-and-death duel, he narrowly won with a royal flush, but was forced into a desperate situation by his opponent with his extraordinary ability. At a critical moment, he accidentally activated the mysterious power in his body - the 'FGO system'. The guide 'Sakura' then arrived and told him that he was the descendant of the ancient demon god 'Kagu Tsuchimyo' and the God of Storms. He had the unique 'fire and wind dual bloodline of gods and demons' and could control a special law called 'elemental reaction'. From then on, starting from the campus, he embarked on a path that combines extraordinary gambling skills with the power of gods and demons, rises from the underground world, and fights against the ancient forces that covet his blood. The ultimate goal is not only to control his own destiny, but also to redefine the balance between superpowers and the world in the city, and to protect the ordinary daily life he cherishes.
