Kasahara Kiyoshige, the warlord of Shiga Castle in Shinano, raises an army against the Takeda clan. Harunobu is irritated at being still unable to assume full control of Shinano. Takeda’s army advances on Shinano to capture the castle. Itagaki’s troop defeats the reinforcements sent by Kasahara’s ally. Although Kansuke proposes that Harunobu urge Kasahara to surrender, Harunobu commands his troops to behead the enemies and put the heads around the castle.
Having succeeded in capturing Shiga Castle by force, Harunobu declares war against Murakami Yoshikiyo, the warlord who dominates the northern part of Shinano. Kansuke tries to dissuade Harunobu but his efforts end in vain. Complains against continued battles increase in Takeda’s territory. Itagaki is anxious about challenging Murakami, the strongest warlord in Shinano, in such circumstances. Meanwhile, Amari, a chief retainer of the Takeda clan, goes to Shinano suddenly to meet Murakami. Amari says to Murakami that he will betray the Takeda clan in order to unify Kai.
In February 1548, Takeda’s troops advance on Shinano. The vanguard led by Itagaki and Amari battles against Murakami’s troops in Uedahara. Itagaki is ready for death and tells Kansuke to be a real military strategist and protect Harunobu. On the night, Amari defects to the enemy, as he promised with Yoshikiyo Murakami. Hearing this, Harunobu is outraged but Kansuke perceives that Amari is just pretending to be a traitor. As Kansuke infers, Amari tries to kill Murakami, but fails and is caught. Meanwhile, Itagaki’s troop is surrounded by Murakami’s army, having chased the enemy too far against Harunobu’s command. Although Takeda’s troops battle with all their force to save Itagaki, he dies on the battlefield.
In the battle at Uedahara, the Takeda clan has lost two generals—Itagaki and Amari. Though he at first refuses to admit his defeat, Harunobu decides to retreat in the end. In Kai, Harunobu repeatedly asks himself why he lost. Revolts against the Takeda clan break out in various areas and Kansuke is busy to contain them. The Ogasawara clan, a feudal lord of Shinano, seizes the occasion and invades Suwa. Owing to Kansuke’s tactics and preparations by Itagaki, who had foreseen the situation, Takeda’s army defeats the troops of Ogasawara.
Around the same time that Harunobu and Kansuke defeat the Ogasawara clan, Kagetora Nagao becomes the head of the Nagao family, succeeding his elder brother. Things finally calm down in Shinano. Kansuke goes on a trip to obtain guns, foreseeing that the new weapon is the key for future victories. Coming back to Kai, Kansuke tells Harunobu about his grand plan of seizing control of Echigo, Suruga, and then the whole country. Kansuke asks Harunobu to let him infiltrate Echigo to spy on their potential enemy.
Harunobu finally conquers the Ogasawara clan and seizes their territory in Shinano. His only great enemy of Shinano, Murakami, remains. Capturing the impregnable Toishi Castle is the key in defeating Murakami, and Sanada who used to preside over the territory takes on the important task. Although Sanada is eager for take action, Kansuke dissuades Sanada foreseeing it as premature. Kansuke infiltrates to Echigo to ascertain Kagetora Nagao's caliber. Meanwhile, Sanada plots the invasion of the castle against Kansuke's admonition.
Kansuke disguises as a gun trader and meets Kagetora. He offers Kagetora 10 guns, but he demands to provide 100 guns, saying he will take Kansuke as a hostage until he meets the demand. Although Kagetora is almost certain that Kansuke is the general of the Takeda clan, Kansuke has no intention of responding to Kagetora's demand and is pleased to become a hostage, taking the advantage to spy on the Nagao family. Kagetora takes him to Usami's castle, a neutral warlord in Echigo, whom Kagetora hopes to win him over to his side. Meanwhile, Harunobu advances on Murakami to capture Toishi Castle and suffers an unexpected crushing defeat.
Kansuke's disguise as a gun trader does not deceive Usami. Kagetora entrusts Kansuke to Usami, as an indication of Takeda's plot to seize Echigo and make Usami realize the importance of unifying Echigo. Usami understands Kagetora's intention and decides to serve the Nagao family. Meanwhile, Kansuke is unable to meet Kagetora's demand and is set to be executed.
Harunobu saves Kansuke and goes back to Kai. During his absence, the Takeda clan was severely defeated by Murakami and Sanada, the very person who caused the defeat, is under fire from the retainers of the Takeda clan. For Sanada to wipe the disgrace and survive, he must succeed in capturing the impregnable Toishi Castle. Kansuke initiates Sanada a secret plan—to persuade Takanaga Tokita, Sanada's younger brother who presently serves under Murakami, to become a retainer of the Takeda clan.
Hara, Takeda’s retainer, suddenly introduces his daughter Ritsu to Kansuke to be his wife. Ritsu’s passionate approach to Kansuke appalls him. On the way to Suwa to visit Princess Yu, Kansuke encounters a suspicious group escorting a beautiful princess, Ogoto. Having heard from Ritsu that Harunobu will receive a new concubine, Kansuke links the princess as the new concubine. Yu is jealous of Ogoto and anxious about her son Shiro’s future which might be threatened by Harunobu and should Ogoto bears his child.
Kansuke, prepared to kill Ogoto on behalf of Yu, loses his motivation, recognizing her innocence and beauty. Instead, he advises her to respect Yu’s son Shiro as the successor of the Takeda clan. On New Year’s Day in 1552, Oyamada, Takeda’s general, is killed by his concubine, Miru. She had long felt resentment toward the Takeda clan for her husband, Sasahara, was killed by them.
As Harunobu’s mother senses that her death is near, she is concerned about Harunobu’s future and entrusts Kansuke with Harunobu. Meanwhile, the army of Norimasa Uesugi is driven into a corner by Ujiyasu Hojo, whose family dominates the Sagami and Musashi regions, and Uesugi runs for Echigo seeking Kagetora’s assistance. Meanwhile, Kansuke proposes to Ujiyasu a three-line alliance: Takeda, Imagawa and Hojo.
After strengthening the tie with the Imagawa family by the marriage of Imagawa’s daughter and Harunobu’s son and heir Taro, Takeda’s troops finally advance on to Shinano defeating Murakami. A well thought-out strategy by Kansuke causes the feudal lords of Shinano to surrender to the Takeda clan without a battle one after another and Murakami instantly becomes isolated. Foreseeing a no-win situation, Murakami runs to Kagetora in Echigo. Kagetora makes up his mind to advance on to Shinano to restore order, having learned of Takeda’s villainous plot from Murakami.
In August 1553, the troops of Echigo led by Kagetora advances to Kawanakajima of Shinano and the first battle of Kawanakajima breaks out. Foreseeing that Kagetora’s target is to behead Harunobu, Kansuke counterplots by not fighting back but instead drags Kagetora south. Usami, a general of the Nagao family, detects Kansuke’s plot and shifts their course toward Fukashi Castle, Tadeda’s strategic point in Shinano, for the purpose of decoying Harunobu towards the battle field.
After the first battle against Kagetora, Harunobu visits Yu in Suwa. Having heard that Kansuke might marry Ritsu, Yu has mixed feelings. Meanwhile, Kansuke embarks on the three-line alliance among Takeda, Imagawa and Hojo, while Kagetora heads for the capital, Kyoto. The year after, Harunobu, Yoshimoto, and Ujiyasu gather at Zentokuji Temple in Suruga to confirm their alliance.
Yu falls ill and tells Kansuke that her death is near. Kiso is chosen by Yu for Kansuke's next conquest. On the day Kansuke is to leave for Kiso, Yu urges him to get married as soon as he comes back, which he promises to do. While Kansuke and Harunobu are invading Kiso, the troops led by Kagetora also advance to Zenkoji Temple.
Yu passes away before Kansuke comes back from the battle. He remembers her last words urging him to marry and leave an heir. Kansuke leaves a note to Harunobu and goes on a trip to shake off his unsettling mind. Meanwhile in Echigo, unified by Kagetora, conflicts over the territory between the ruling families continue as a result of the long drawn out battles. Kagetora is disappointed with the quarrels among his retainers and suddenly disappears from Echigo.
Kansuke decides to adopt Ritsu instead of marrying her. Harunobu succeeds in persuading Nagao's chief retainer to take on Takeda's side. Harunobu gaining momentum advances on to northern Shinano, to obliterate Nagao family's influence. Although Kagetora also leads his troops forward, Takeda's troops avoid armed confrontation. The battle between Takeda and Nagao comes to an end by the order of Shogun Yoshiteru Ashikaga. Harunobu accepts the order in exchange for becoming a federal lord of Shinano. He declares that he will enter priesthood and changes his name to Shingen. Kansuke follows and changes his name to Douki.
Usami, a general of the Nagao family, sends Heizo to Suruga to see Toraoumaru, Yu's half brother who is also the bereaved child of the Suwa Family. Heizo and Toraoumaru, harboring resentment against the Takeda clan, infiltrate to Kai. Having heard that strange young monks are seen around Shingen, Kansuke is suspicious.
Usami's assassination attempt on Shingen fails. Kansuke's mistrust fuels towards the Imagawa clan in spite of the alliance between Takeda and Imagawa. In 1560, Yoshimoto decides to head for the capital, Kyoto. He sends his troops to Owari which is under the control of the Oda Family. Kansuke starts plotting a new scheme for if Oda wins, it would be an excellent opportunity for the Takeda clan to seize Suruga.
In 1560, Kagetora advances onto Kanto defeating Hojo in order to restore the Kanto area. Around the same time, Yu and Harunobu's son Shiro celebrates the coming of age and assumes Suwa's surname. Warlords of Kanto gather around Kagetora to take his side which soon numbers to 100,000 forces. Usami fears Kagetora's arrogance. The troops led by Kagetora surrounds the impregnable Odawara Castle, the strategic point of the Hojo clan. Kagetora decides to take over as the head of the Uesugi Family, and changes his name to Masatora Uesugi.
Masatora realizes that his failure in capturing the Odawara Castle was due to his arrogance. He reaffirms his determination for the next battle against the Takeda clan. Sensing that the decisive battle is near, Kansuke urges his adopted daughter Ritsu to marry. In August 1561, the Uesugi clan's 13,000 troops head to Kawanakajima in Shinano.
In August 1561, Uesugi's troops led by Masatora advances onto Kawanakajima. Learning the move, Shingen and Kansuke also heads for the crucial fight. On the way to the battle, Kansuke stops by Yu's grave where her apparition appears, urging him not to go. In Kawanakajima, Masatora takes up a position on Mt. Saijo in Takeda's territory, however, Kansuke notices Masatora's plan to decoy Takeda's troops towards them which leads the battle into a standstill.
After hearing an old woman's prediction that thick fog will descend in Kawanakajima the following morning, Kansuke decides that the time has come for him to make the move. Kansuke divides Takeda's troops into two forces―8,000 main forces led by Shingen to wait at the mountain foot and the other 12,000 forces to attack Uesugi's troops on the mountain from the rear. However, the attempt to trap the enemy had been foreseen.
On September 10, 1561, the fierce battle between Takeda and Uesugi rose to its peak. Kansuke's strategy was foreseen by Usami and Uesugi's troops led by Masatora attacks Takeda's main forces. Shingen loses his brother and a general and Takeda's troops were on the verge of destruction. While Shingen waited for another force of 12,000 to arrive for support, Kansuke decides to attack the enemy himself to protect Takeda's main forces.