In modern-day Shibuya, ninjas still exist. One of them is Enma, a master of fire techniques and the second son of the Iga Six Brothers. The brothers covertly protect the city by accepting requests for helping people and conducting spy missions. However, following the shocking event where the eldest brother, Shido, murders their father, Enma and his siblings become entangled in a series of incidents and battles against rival Koga ninjas. The central question remains: Can Enma reunite his family and continue safeguarding the streets of Shibuya? Original Webtoon