Amamiya Brothers

Amamiya brothers are three brothers, Takeru, Masaki, and Hiroto. They are the strongest in High & Low with Kohaku, Ice, and Genji being the few people that can be on par with one of them.

History
Takeru and Masaki are biological brothers but after their father remarried, Hiroto became their step-brother. Their family is poor but they still managed to spend their time together happily. The Kamizono-kai of Kuryu group always come to threaten Sosuke Amamiya, the father of the brothers, to give up their factory. The land where the factory is built in was acquired illegally by the Kuryu group. The parents committed suicide and the brothers swore that they will stick to together and become the strongest. The three brothers grew up together, and work as mercenaries for some people. During those times, Takeru found out about the truth of their parents death and investigated it further without involving his younger brothers. He then left his brothers to infiltrate Kamizono-kai and get revenge.

Reputation
The Amamiya brothers are considered as powerful individuals and feared by many people, even outside of SWORD. Anyone who tries to challenge them gets beaten. Members of SWORD often display a fearful or bitter attitude towards them, like when Oya High members were frightened when they encountered Hiroto ; Murayama has a spiteful attitude towards Masaki ; Smoky and the Rude Boys were surprised as to why Hiroto helped them ; Yamato still hasn't moved on from their defeat against Masaki and Hiroto. Their strength can equal that of a large gang. Hiroto and Masaki alone defeated the legendary Mugen with over 100 members. Among the three brothers, Takeru is considered by many as the strongest.

High & Low Story of S.W.O.R.D Season 1
Hiroto is first seen talking to Masaki on the phone and walking towards a vending machine to buy a drink while completely ignoring Oya High students' plan to beat up Chiharu. One of them was bothered because Hiroto just walked in without giving any thoughts about them. Due to their pestering, Hiroto was annoyed and beat up five of them while casually talking on the phone. When Hiroto put down his phone, the two remaining students were frightened after recognizing him.

Murayama along with Seki and Furuya were walking at night while discussing Iemura-kai. A few seconds later, Masaki passed by them and parked his motorcycle. Furuya recognizes that he is one of the Amamiya Brothers. Murayama, on the other hand, asked infuriatingly why is Masaki back in SWORD again. Masaki just gave them a glance and went inside a bar. The reason why he is there is just to spot girls. He met Junko but got suddenly turned off by her. As he walked out, he asked Hiroto if he want to go get something to it. At the same time, Masaki recognizes Kohaku riding a motorcycle. He then said that SWORD is an interesting place.

High & Low Story of S.W.O.R.D Season 2
The story of the clash between the Amamiya brothers and Mugen was revealed in this season. Masaki and Hiroto were riding along until they encountered a group of people from Mugen. Masaki tells Hiroto to ignore them and go home, but one member kicked Hiroto's motorcycle which prompted him to resort to violence. Masaki tried to stop Hiroto but he was kicked in the back. Masaki, who became infuriated, also proceeded to resort to violence. Masaki and Hiroto defeated them easily. However, Hiroto was still not satisfied and asked one of the men to take them to their leader. After a while, the two of them arrived at Mugen's hideout. Hiroto was excited to see how many men that they have to face. After tossing his helmet to Yamato, the legendary fight between the Amamiya brothers and Mugen began. Masaki and Hiroto defeated all of Mugen's subordinates. Cobra and Yamato were next to fight them but were also overwhelmed by the brothers. Kohaku and Tsukumo decided to step up, making it a 2 against 4 battle. The fight continues and it grew more intense. The brothers were exchanging opponents simultaneously until Hiroto and Cobra finds themselves separated while Masaki is handling Kohaku, Tsukumo, and Yamato. Cobra managed to get an opening on Hiroto and tries to knee him multiple times but Hiroto blocked them all. Hiroto then proceeded to punch Cobra in the face. When Cobra was about to strike again, Hiroto elbowed him in the face and threw him into Kohaku, after realizing his brother is having a hard time. Masaki managed to kick Kohaku away, and when they were just about to continue, Kohaku suggested that he fights alone. Masaki stopped Hiroto, indicating he will take on Kohaku in one on one fight. Masaki and Kohaku engaged in a ferocious fight, to which there was no clear winner.

After the fight, Tsukumo explained that even though they had the numbers and advantage, they were unable to defeat the Amamiya Brothers. At the Itokan diner, Cobra is seen lamenting about their loss and Yamato was annoyed at him. Tatsuya scolds both of them about not taking on the brothers again. He later explained to everyone that many people tries to improve their reputation through the Amamiya brothers, but all were defeated by them. He further added that the eldest brother is even stronger.

After Mugen disbanded, the Amamiya brothers disappeared and became legends.

High & Low The Movie
Masaki and Hiroto went to Nameless street to find clues about their older brother, but arrived there after the bombing. Hiroto helped Smokey when he was in a tight situation against Ryu. The two of them tries to defeat their enemies but Ryu managed to slash Smokey's back. Hiroto prevents Ryu from inflicting even more injury by taking him on. Hiroto dodged all of Ryu's attack and managed to land a hit on him. Just as he dodged Ryu's counter-attack, Ice dealt two heavy blows on Hiroto and mocked him by saying he is not as strong as the rumors say. Hiroto told Ice that he won't forget his before following the Rude Boys. He got Smokey a doctor and when he was about to leave, Lala followed him to express her gratitude. Hiroto handed her the payment for the doctor. However, Lala was kidnapped by Doubt members when she was about to head back inside. Smokey asked Hiroto to save Lala before giving him clues about their brother.

Hiroto and Masaki arrived at the container yard while everyone is in the middle of the fight. They managed to get through before the cargo blocked the entrance inside. The two of them looked for Lala while beating down anyone who gets in their path. After a while, Ice arrived with plenty of henchmen and amused that he met Hiroto again. Ice suggested that they continue their fight, and Hiroto asked Masaki to take care of the rest while he take him on. Hiroto and Ice were of equal footing, they kept going on until Kohaku was taken care of. Even Masaki was amazed at how long they were fighting. Ice refused to end their match even though S.W.O.R.D was the victor of the battle. They were finally stopped after the rest of the Mighty Warriors and Masaki, who rescued all the girls, arrived. 9, Pearl, and Sarah managed to convince Ice that there is no point in fighting further. Ice kicked a container out of frustration, but he later complied. Ice told Hiroto in a lighter note that they will see again soon before leaving. Hiroto only managed to smile after the fight, showing how he enjoyed it. After rescuing Lala, Smokey gave him clues but told him that their brother is not the same man as before.

High & Low The Red Rain
This movie is a spin-off about the Amamiya brothers. The first scene shows the brothers doing a job for an organization 1 year prior to the events of the series. It was also the last time Masaki and Hiroto saw their brother before his disappearance. Back to the present. Masaki and Hiroto were wondering if Takeru will show up at the cemetery where their parents are buried. The two brothers went to give flowers to their parents' grave. They were disappointed that Takeru didn't come but they met Aika who is acquainted to their brother. Aika is being the targeted by the Kamizono-kai because she knows where the USB containing the secrets of Kuryu group that was owned by his father. Masaki and Hiroto protects Aika while they search for Takeru. Aika tells them that Takeru infiltrated Kamizono-kai and protected her after he finds her being hunted down. After a while, they received a telephone call from someone who Takeru entrusted to decipher the USB. They went to the hacker who identifies herself as Furuno. However, Furuno was unable to decipher by herself and asked them to take her to SWORD because she knows someone who is more skilled than her. At the Itokan diner, Noboru tries to decipher the code, but the atmosphere inside the diner is thick due to the presence of Masaki and Hiroto. Yamato arrived wondering why the diner is so dim but his expression changes after he noticed the two brothers. Dan, Chiharu, and Noboru calmed him down by saying the USB that they have holds information that could destroy Kuryu. Masaki asked Hiroto and Aika to go somewhere with him to avoid bringing an awkward atmosphere in the diner. Before they left, Cobra tells Masaki that SWORD owes them when they helped fight Mighty Warriors and Doubt. Masaki responds that SWORD never owe them anything.

Masaki and Hiroto takes Aika to their parent's former factory. The childhood of the brothers was revealed. It was also revealed that Hiroto is their step-brother. Their parents committed suicide at the factory but Hiroto believes that it was not suicide. The brothers grieved under the rain and promised that they will become the strongest.

At the present, Masaki recognizes the guy that their father is indebted with is Tatsuomi Kamizono. They realized that the reason Takeru infiltrated Kamizono-kai is to get revenge. Aika received a phone call from Furuno, informing them that she tracked Takeru in Little Asia. Noboru added that the Kamizono-kai bought guns from the black market and Takeru did as well. Masaki and Hiroto went to Little Asia to find their brother but only got a glimpse before he disappeared again. Furuno informed them again that he went to the church after calling Tatsuomi Kamizono. At the Itokan diner, Noboru and Furuno managed to decipher the USB. Masaki and Hiroto went to the church and fought a group of armed men to get to Takeru. When they arrived, they saw Takeru surrounded by a fully-armed Kamizono-kai while holding the fake USB as a bait to kill Tatsuomi Kamizono. Takeru threw the fake USB to distract them while he pull his gun to shoot Kamizono, but Kamizono used one of his men as a shield. Takeru sought cover from the gun shots with his brother. He then revealed that Kamizono killed their parents, and he infiltrated the group to get proof. However, he was so focused on revenge that he forgot his principles and goal. Takeru engaged in a shootout with the Kamizono-kai, and just as he managed to shoot them all, they were faced with a machine gun. Takeru and Hiroto ran from it and changed cover. Realizing they are surrounded in all sides, Takeru exposed himself and shot all of the remaining members. He managed to shoot them all but he received a lot of gun shots, causing him to draw his last breath. Hiroto and Masaki cried their heart out and Aika arrived only to find Takeru passed away.

Masaki and Hiroto invaded the Kamizono-kai's mansion to get revenge for their brother. The two of them wiped out a fully-armed group, showing their mastery at zero range combat. After that, they find themselves in a highway chase after Kamizono who fled in his vehicle. They managed to crash Kamizono's vehicle and Masaki almost beat him to death due to his anger, but later controlled himself.

Under Ryushin's order, Ryu killed Kamizono and took his spot in the 9 dragons. Hiroto asked Masaki whom did he give the USB to. Masaki then responded by saying he gave it to the man he trust the most, Kohaku.

High & Low End of Sky
Masaki is wondering why Kohaku still haven't publicized the files of the USB. Masaki is slightly irritated when he found out that Kohaku went overseas without him knowing. Kohaku then explained to Masaki that the one who should do be publicizing the USB is the brothers, because Takeru worked so hard to protect it. Just as they were about to upload the files to reveal it to the public, they were attacked by fighters of Kuryu group, including Genji. Masaki, Hiroto, Tsukumo, and Kohaku engaged in a highway chase against Kuryu group to gain possession of the USB. They managed to steal the USB from Genji and hand it over to Furuno in the van. They have hard time to insert to USB due to a car bumping them from behind. Kohaku is protecting Furuno from the swarming enemies while she drives. Masaki and Hiroto hurries to their aid. Masaki jumps inside the van by using the car beside as a leverage, and Furuno got out of the van with Hiroto's help. The brakes of the van are broken, Masaki was able to insert the USB and press the enter key to upload the files. Masaki tied Genji in a pole to allow them to escape. Masaki and Kohaku jumped out of the van in time before it fell to the river.

High & Low Final Mission
Saigo saved Hiroto from being sniped by Kuryu group. He then led Hiroto, Masaki, Tsukumo, and Kohaku to safety. Saigo proceeded to explain to them the history behind the corruption of the casino plan. He asked them to get the evidences that could ruin Kuryu. Masaki and Hiroto chose to find Hajime Baba in Little Asia but weren't able to find any clues. They were insulted by people of Little Asia about their brother which triggered them to take action. After they were done in Little Asia, they then went to Nameless Street. The two of them arrived and saw Smoky passed away. The two brothers along with Kohaku and Tsukumo led S.W.O.R.D in the final battle against Kuryu. When they found Hajime Baba, Genji comes to stop them again. Masaki and Hiroto told the others that they will they care of Genji. The brothers were having a hard time due to Genji using a sword. Eventually, Masaki noticed that using chains will equal the level of the fight. The brothers were able to bring down Genji with perfect coordination. After defeating Genji, they went back to Namless Street to get the documents gathered by Rude Boys. They then proceeded to join Kohaku and Cobra to go to the convention center to expose the truth. They managed to get through a horde of Kuryu members with the help of Daruma Ikka. The brothers were last seen riding along with Kohaku and Tsukumo.