Six years ago, when the Fuuma masked ninja stabbed Yue's chest in the dark, no one expected that the incident would cause such a huge ripple.And that chooser, Takayuki Yamada, the 19th generation Fuma Kotaro, never imagined that his actions would trigger a series of chain reactions, closely linking the fate of multiple people.

Poor, a girl who experienced a family tragedy when she was three years old, a fire claimed the lives of her parents and other passengers.She firmly believes that this is a murder and vows to uncover the truth.As an adult, she became a journalist, digging into Japan's deepest secrets.In the process of pursuing the truth, she discovered that the kidnapping of the politician Mukai six years ago was inextricably linked to Yue's death.This discovery made her decide to investigate further and pursue the truth at all costs.

At the same time, the life of Yue's younger brother Qing also changed dramatically because of the poor investigation.Qing was shocked when he learned the real purpose of poori's daily visits to the beef don shop.However, what is even more shocking is that after he cooperated with Kuze of the Ninja Management Bureau (BNM) and burned all the evidence files in the room, they discovered a new clue - Matsuura.

Matsuura, a murderer who played a major role in the mass poisonings on tour boats, had his name found on the boat list on a shredder.Yoko, a smart and witty girl, grabbed Matsuura's hand and tried to get close to him, but Matsuura left in a hurry.Yangzi did not give up and followed him to an abandoned factory.

On the other side, Nagi came to the designated factory with the hanging scroll he stole from his grandmother.What she was looking forward to was meeting Yue, but it was Fuma's second-in-command, Aya Mei, who showed up.The battle between Nagi and Ayame ended in Nagi's defeat.At this moment, Yoko chased Matsuura and arrived. Matsuura, who transformed into a wind demon, looked at Yoko and said: “I didn't want to meet again in this way”.Yoko started a fierce battle with Fuma's ninjas, but the enemies were numerous and the situation was critical.

At this moment, Zhuangyi received the message delivered by BNM's carrier pigeon, and he quickly rushed to the scene.While defeating Fuuma's ninjas, he teamed up with Yoko and eventually defeated all the enemies.Facing Matsuura, Zhuang Ben wanted to kill him, but was stopped by Yoko.They hope to get more information from Matsuura.

On the other hand, Ouman also comes to the factory to hunt down Nagi who stole the art.He witnessed the ninjas fighting, but was eventually caught by Kuze and others from BNM and accused of being an art thief.However, he is not alone, because he knows that there are more secrets and truths hidden behind this mystery.