In their quiet life, the Tao family seems to be far away from the world of ninjas. However, the shadow of the past always lingers like a ghost.When the BNM (Ninja Management Bureau) came to the door again, the Tao family was once again involved in an unknown storm.

In the past, the Taoka family once fought fiercely with the Fuma Ninja in order to rescue the kidnapped politician Mukai Hitoko.Although Haru won the duel with the Fuma ninja, she was unable to land a fatal blow when the opponent begged for mercy.This decision indirectly led to the death of the eldest son Yue, making him a victim of the masked ninja, and his body sank into the cold sea.This incident made the Tao family decide to retire from the world of ninjas and live an ordinary life.

However, life was not as peaceful as the Tao family wished.Although his father Soichi is ostensibly focused on his home brewing business, his financial situation is not going well.Mother Yoko is tired of her boring family life and repeatedly pickpockets in supermarkets.Nagi was confessed to by Kyotani, but she refused. Instead, she became interested in stealing art and then returning it.Haru, on the other hand, while working as a supplier of vending machines, would go to the beef don shop he often went to every night. There was a poor woman named Ito there, which became a great joy in his life.

However, when BNM's Hamajima came to visit again and asked Soichi to investigate the recent incident in which all passengers on the tour boat died of poison, the Tao family was once again involved in the storm.Zhuangyi refused the request, saying that he would no longer put his family in danger.But things don't end there, Pity's true identity is revealed to be a reporter, and her behavior attracts Haru's attention.

Qing originally had an appointment with Poor, but after the dinner was cancelled, Qing decided to follow Poor.He found out that Piti put on a mask and went to the club to meet a man named Akiyama to collect intelligence about the tour boat incident.From their conversation, Qing learned that a passenger survived the incident and was suspected of being the murderer.However, when Akiyama mentioned “yellow flowers...”, he was killed by an assassin.The assassin then tried to attack Pity, but Qing appeared in time and started a fierce battle with the assassin.

During the fierce fighting, the assassin was injured and fled outside.Just as Qing chased him out, the assassin was hit and killed by a car.However, Haru discovers that the dead man does not have the arm scars he left behind, proving that he is a stand-in and the real assassin has escaped.At this time, Tsujioka, the leader of the new religion Gentenkai, also appeared near a nearby club, and all of this seemed to be inextricably linked to him.

Nagi, on the other hand, secretly took photos of the artwork and posted them on social media.Suddenly, a stranger paid attention to her and asked her: "Do you call yourself a ninja?"%.The appearance of this mysterious man plunged the Tao family's life into chaos again.