The tribe elections are held to decide the new Bey. Dündar comes face-to-face with Osman however, Osman is elected as the new Bey much to Dündar's despair and anger. Meanwhile, a new threat against the Kayı tribe emerges after Petrus, sent by the Pope, arrives to help Nikola kill Osman but also has a secret plan which he doesn't tell Nikola about. Bayhoca, Savcı's son, also returns.

Osman Bey establishes his headquarters in Yenişehir, acting on crucial information from his spy in Constantinople. He faces threats from Northern warriors Olof and Frigg. Bala Hatun and Malhun Hatun prepare for a market in Yenişehir, leading to tensions between Bengi Hatun and Malhun Hatun. The competition between Aktemur and Alçiçek adds to the growing tension.

Yakup Bey confronts Osman Bey, demanding his allegiance. Cerkutay returns to Yenişehir Palace, creating a festive atmosphere but harbors anger towards Osman Bey. Yakup Bey puts Osman Bey in a difficult position with his Lefke move, but Osman Bey intends to outmaneuver him, knowing Yakup Bey's true intentions. Meanwhile, tension rises between Mehmet and Orhan over Holofira, who wants to return to her homeland but faces opposition from Orhan. Gonca seeks a treasure map from Alaeddin Bey, leading to their confrontation at the caravanserai. Alaeddin reunites with his mother, Bala Hatun, who informs him of Yakup Bey's demand for allegiance from Osman Bey. Saadet Hatun arrives in Uç Pazar and reacts strongly upon learning of the assassination attempt on her husband, Yakup Bey. Osman Bey plans to host all the beys and Yakup Bey in his palace, but the real outcome of their tension is yet to unfold.

Osman Bey, now leading a state, aims to unify the Turks under his banner, and influence border principalities. Bayhan Bey and his rival Begüm Hatun attend Osman Bey's wedding, possibly revealing intentions towards his daughter, Fatma Hatun. The arrival of the Caliph's vizier Emir Ömer stirs tension, his purpose unknown to Osman. Emir Ömer secretly informs Karesi Bey of the theft of sacred relics, prompting Karesi to seek them out and offer allegiance to Osman Bey. As Osman expands his territory, Byzantine hopes rest on Commander Lucas, who holds the sacred relics and plots against the Turks. Lucas tries to recruit Holofira, impacting her and Orhan Bey’s paths. Alaeddin Bey is imprisoned in a castle as Osman continues his conquests, facing Lucas's schemes.

Despite numerous challenges, Karadin Castle becomes Kayı property. Alaeddin Bey is exposed to danger during the conquest. Commander Lucas devises a plan to find and exploit the weaknesses of Osman Bey and Karesi Bey, aiming to set them against each other. Lucas, holding sacred relics, plans to use them as leverage. Osman Bey's tribe is alarmed when the relics are stolen, and he confronts Lucas. The fight for Karadin Castle ensues with Begüm Hatun and Bayhan Bey vying for control, while Bala Hatun remains disinterested. Holofira, under Lucas's orders, arrives uninvited at the celebration, rekindling her love with Orhan Bey, who proposes marriage. Saruca and Yusuf compete for Fatma Hatun's affection. During Gonca Hatun's difficult childbirth, Begüm and Hazal Hatun clash, with Begüm accusing Hazal of poisoning her.

Osman Bey's pledge to protect the sacred Islamic relics elates the Kayı tribe but fuels Karesi Bey's jealousy. To thwart Osman, Lucas sets a trap in Karadin, complicating Begüm Hatun's situation. After her setback, Begüm plots to undermine Bala Hatun. Meanwhile, it's revealed that Cecilia poisoned Gonca Hatun, straining her relationship with Holofira. Orhan Bey devises a plan to kidnap Holofira from her arranged marriage, but they encounter a trap. Lucas and Karesi plan to financially damage Osman by building a bridge. Osman discovers Karesi's deceit. The unfolding drama sees Gonca's feelings towards Holofira change, and the possibility of Orhan and Holofira's reunion.

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Tekfur Alexis of İnegöl seeks revenge on the Kayı tribe for conquering Kulucahisar. He invades a caravan of the Kayı tribe, Osman, takes his revenge by defeating him in a battle. After the battle, the Emperor, concerned over the Turk threat on his empire, sends Aya Nikola to İnegöl Castle. Nikola kills Alexis for his failure and snatches the castle from him. Nikola also frees an old friend from prison, Flatyos. Ertuğrul also later returns towards the end after a year in Konya.

Arslan tasks Cerkutay, who is alive, to go to Geyhatu, who already hates him because of him being loyal to Balgay, and tell him that Osman captured Möngke. Geyhatu, who is in Konya planning to kill his brother, Argun, is angered over this and allows Cerkutay to live if he is loyal to him. Meanwhile, Söğüt perishes due to the disease spread by Flatyos on the orders of Nikola followed by an explosion done by the same people.

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Olof's personal stake in Yenişehir drives him to take risks, while his lover Frigg poses a threat to Malhun Hatun. In Constantinople, Kantakouzenos involves Ofelia, further complicating matters. Osman Bey takes on the responsibility of confronting and resolving the chaos, arranging a meeting with Olof in the arena.

Osman Bey gathers his people to save Gündüz Bey and plans a strategic move against İmren Tegin. He also acts to save Uç Pazar, raising the Germiyan flag there again, which could impact Germiyan-Kayı relations positively. Osman Bey asks Alaeddin Bey to make a sacrifice for their principality's future, similar to what Orhan has done. Meanwhile, Holofira returns to the tribe after a final farewell, causing potential revelations for Orhan. As İmren Tegin plots against Osman Bey, Osman focuses on conquering Atranos Castle and has captured İmren Tegin, deciding on his fate.