The plot follows the previous one: It turns out that in that year, Aonuma Shizuma was conscripted into the army together with the inuyasha God Sasaki. The two had also met on the battlefield in Burma, and because they looked very similar, even the voices of the speakers were very close, and the two seemed to meet another self. When they inquired about each other, they found that they were actually the relationship between uncle and nephew. After Sakei learns from Shizuma that Kikuno was expelled from the Inuyasha family, he spends his days depressed and dies soon after. Shizuma was raised by Kikuno's relatives. Although Zuoqing deeply sympathized with this miserable uncle, he could not help it. Soon, though, the two also lost contact on the battlefield. Later, when Sasaki read in the newspaper the news that his grandfather Sabei had died and the family members were fighting for the inheritance, he immediately realized that Shizuma had come back to fight for the family property pretending to be himself. However, after Zuoqing secretly returned to the manor out of sympathy, he did not directly expose his identity, but privately asked him to meet at the lookout. After discussion, the two decided to change their identities first, wait for Sasaki to marry Zhu Shi, inherit his grandfather's inheritance, and then divide half of the inheritance to Shizuma. However, while the two of them were discussing, they saw that Satake and Zhu Shi had also come to the lookout. Hiding in the shadows, Sasaki and Shizuma witness Satake's insults to Zhu Shi. When the maid Saruzo arrives in time to save Chu Shi, after leaving, they see Matsuko suddenly appear and stab Satake directly from behind with a knife. Saqing, who saw his mother killing people, was stunned. However, Shizuma saw this scene and used this to blackmail Saqing, temporarily changed his mind, and decided to disguise himself as Sasaki forever and occupy his identity. Stay in the Inuyasha Manor, marry Zhu Shi, and inherit the inheritance. Therefore, when the members of the Inuyasha family asked to verify Sasaki's palm prints, Shizuma coerced Sasaki into putting on a mask and pressed the palm prints for himself. However, Matsuko did not dispose of the body after killing Samu because she did not care about her crime being exposed. Her plan is to clear the way by solving Satoshi before the police solve the case and clear the way for her son to inherit the inheritance. The people who cut off Samu's head and mounted it on the figurines were Sasaki and Shizuma. This is the plan that Shizuma came up with, and he says that in order to clear Matsuko's suspicions, the means must be cruel. In this way, the police will not suspect the weak and timid women. As for the pocket watch in Saomu's pocket with Shizuma's fingerprints glued to it, they also took it. Afterwards, seeing that Satake's head was mounted on top of the figurines, Matsuko suspected that her son had helped her handle the scene, and she did not say anything. On this day, Satoshi stunned Zhu Shi and dragged her to the abandoned hut. This scene was seen by Sasuke, who had been secretly protecting Zhu Shi, and he followed them to the abandoned hut, and just when Sachi was about to insult Zhu Shi, Sachi knocked Sachi unconscious with a stick from behind, and then tied him up. Moreover, it was he who called Ape Zang and asked him to come and save Zhu Shi. However, the call is overheard by Matsuko, who also goes to the abandoned hut and strangles Satoshi with a hemp rope. Subsequently, Sakei and Shizuma forged the scene again and tied a string around his neck. Their purpose in doing so was to get people to blame the two murders on Kikuno's curse. After killing Satake and Sachi, Matsuko also relaxed her heart, because of this, the possibility of Sasaki inheriting the inheritance increased greatly. However, at this moment, Shizuma shows up to Matsuko and reveals his identity. It turned out that among the three sisters, the person he hated the most was the eldest sister Matsuko, who not only humiliated her mother, but also left an indelible scar on her leg with a soldering iron. In order to get revenge on Matsuko, he deliberately revealed his identity to Matsuko. She laughed at the fact that her hands were stained with blood and she ended up getting nothing. At the same time, Shizuma also threatens Matsuko that if she reveals her identity to outsiders, she will expose her murderous atrocities one by one. However, what Shizuma did not expect was that Matsuko did not care about the exposure of her crimes, all she cared about was whether her son could inherit the family's property. She took advantage of Shizuma's triumphant moments to smash his head from behind with a hammer. However, this scene was accidentally seen by Ape Zang. Matsuko asks Theozo to hide it for himself. Because now that all three of Sabei's grandchildren are dead, Zhu Shi is the only heir to the estate, and she can marry anyone who is willing to marry. In order to protect Theo, Saruto agreed to Matsuko's plea and disposed of Shizuma's body.
Finally, the truth of the four murders surrounding the legacy of the Inuyasha family was revealed, and Matsuko, who committed a series of murders, chose to commit suicide by taking poison. Although ZuoQing did not kill anyone, he would also face imprisonment for covering up and destroying his body. Before being taken away by the police, Zhu Shi confessed his true feelings to him and expressed his willingness to wait for him to return from prison. In fact, if Matsuko does nothing, her son can inherit all the property of the Inuyasha family, but unfortunately she is blinded by greed and jealousy.
This is the "Inuyasha Family" from the Japanese mystery movie "Kaneda Ichi Detective Series" released in 2018. A woman from a rich family, in order to let her son inherit the family's huge inheritance, finally embarked on the road of no return to kill four people in a row.
