戦神、再び~裏切りの皇子、王として帰還す~

He guards the border for three years for his country. But his father, the emperor, his mother, and his older brother join forces to set him up. They force him to jump off a cliff. He survives and gathers the people to build his own kingdom. When his homeland is in danger, his family has no choice but to ask him for help. What will he choose to do?