|It starts with the encounter between Tastuya and Usami Yuuki. Usami Yuuki was being chased by thugs but was rescued by Tatsuya by calling his name in the public, and Tatsuya could not ignore it, so he stepped in. (Usami Yuuki is a friend of Leo. She is currently working as a virtual idol. She was first introduced in another side story.)
After few days from the previous event, the scene changed to the tea shop at the hotel owned by Kuroba House, Kuroba Fumiya and his employee, Hashibami Yuki are having conversation about the incident that Tatsuya was involved in. According to their conversation, Usami Yuuki is a genetically altered magician, but she is a “failed” magician. She cannot use magic, but she still carries genes of a magician. So, she is being targeted by Yakuza gang that is kidnapping and selling people like Yuuki to 3rd world country that cannot afford money on building the facility to produce genetically altered nations. For this incident, Yakuza gang was hired by Philippine Mafia. Fumiya is having a meeting with Yuki because he is afraid this Yakuza gang may go after Tatsuya for interrupting their kidnapping operation. Yuki takes a job from Fumiya.
Yakuza gang’s boss name is Mismi Kenzo. He is discussing with his counterpart, Carlo Castiyo who runs a comparatively large organized crime syndicate (mafia) in Southeast Asia. Carlo Castiyo stressed importance of their target, Usami Yuki. Mismi Kenzo makes a joke by labeling Carlo Castiyo’s customers (high officers at Philippine army) as pedophiles for requesting high school girls and a virtual idol such as Yuki. After the communication, Mismi Kenzo summons his subordinates to gather intelligence on Shiba Tatsuya. His subordinate informs him what he found about Shiba Tatsuya and why Shiba Tatsuya saved Usami Yuuki. The subordinate told Mismi Kenzo that Shiba Tatsuya may have involved with Yuki because Yuki’s man(Leo) is a friend of Tatsuya. And, the subordinate also informs Mismi Kenzo that Tatsuya may have a friendly relationship with Kokonoe Yakumo, and this information made Mismi Kenzo to worry. But, Mismi Kenzo assumes as long as Tatsuya is not Yakumo’s student, Yakumo will not make a move against Tatsuya. Finally, Mismi Kenzo made a decision to cancel his plan to kidnap Usami Yuuki and ordered to prepare his man with bomb nearby Tatsuya’s house as insurance if Tatsuya makes a move against Kenzo.
Mismi Kenzo received unexpected news from Carlo Castiyo. Carlo Castiyo is coming to Japan because his customer was pissed off because Usami Yuuki was not included in the shipment. Mismi Kenzo was not happy because he is a very careful man when it comes to the security, but in this case he has to take a risk and join if Carlo Castiyo will be participating the kidnapping operation. At the end of the scene, the narrator mentions the background information of Mismi Kenzo; he is not a simple Yakuza boss, but he and his subordinates are a decedent of Negoro-gumi; The Negoro-gumi was an order of warrior monks based in Negoro-ji temple. They were famous for their skill with firearms.
On the night when Carlos Castiyo arrives at Japan, Hashibami Yuki infiltrated the warehouse where kidnapped girls were kept, and there are about twenty girls. When Mismi Kenzo and Carlo Catiyo greet, Yuki made her move and tried to kill Mismi Kenzo, but Mismi Kenzo’s subordinate blocked Yuki and got killed by Yuki. But, Yuki lost a chance to kill Mismi Kenzo due to ten snipers that are shooting at Yuki. The Negoro-gumi has both fine marksmanship and an ability of being patient without getting noticed. Just like Mismi Kenzo, Yuki is also a decedent of Ninja not a traditional magician but a trained soldier; a soldier with extreme body control ability. But, Yuki cannot handle all the snipers, but she was saved by Fumiya.
After Fumiya’s arrival, none of Carlos Castiyo’s men and Mismi Kenzo’s men is standing. Only Mismi Kenzo is standing. Fumiya requests information on kidnapping operations by Mismi Kenzo, and Fumiya confirms that this deal is made on behalf of Ministry of Foreign Affairs. Mismi Kenzo refuses the offer, and he suddenly threatens Fumiya by telling Fumiya that Mismi Kenzo’s men is ready with bomb nearby Tatsuya’s house. (The book does not mention how Mismi Kenzo connects Fumiya with Tatsuya)
Fumiya tells Mismi Kenzo that if Mismi Kenzo orders his men to bomb Tatsuya’s house, Mismi Kenzo will be dead. Mismi Kenzo ignores the warning and sends a signal to his men. Soon after that, Mismi Kenzo’s body banishes. At the very end, Hashibami Yuki’s experience with Tatsuya is revealed. She tried to kill Tatsuya, and she was engraved with fear in her soul. As long as fear exists, she cannot bother Tatsuya. She is working for Fumiya to eliminate fools who are committing the same crime that she committed in the past. She is doing this in order to ease her fear in her soul.
(Credit to TrueAlchemist)