The first episode of the series, directed by Metin Günay and written by Mehmet Bozdağ,[2] was aired on November 20, 2019, on the ATV network.

[4] The story includes Osman Ghazi's internal and external struggles and how he establishes[5] and controls the Ottoman Empire.

The character of Osman faces many enemies and traitors in his quest, and the show illustrates how he was able to overcome these obstacles to fulfil his mission with the help of loyal companions, family, and friends.

It began in December 2014 and Season 5 of the show concluded with Ertuğrul convincing Berke to start a war with Hulagu Khan.

Ten to fifteen years[b] after the Berke-Hulagu war, Ertuğrul Ghazi goes to Konya and he leaves his brother, Dündar Bey, in charge of his tribe.

He falls into the trap of the devious Selçuk Sançak Bey Alişar, and the merciless princess of Kulucahisar, Sofia, who seeks to kill all the Turks.

Osman, Dündar's nephew, can see through Alişar and Sofia's plans and warn him about them, despite his refusal to listen.

Following this, after many difficulties, Balgay is presumably killed by Osman while Kulucahisar is conquered by the Kayı with Sofia's death happening in the process.

[6] Aya Nikola is sent by the Byzantine Emperor, Andronikos II to become the new Tekfur of İnegöl followed by Ertuğrul's return to the tribe.

Bala also faces the arrival of Targun, Nikola's spy, who allies with Osman to save her father, İnal Bey.

After Targun's death, Osman meets Malhun Hatun and initiates a major battle with the Byzantines, historically known as the Battle of Mount Armenia, as well as trying to find the traitor in the Kayı, as his jealous uncle Dündar helps the Byzantines stir traps for him.Osman eventually executes Dündar for his treachery.

Following the arrival of Ömer Bey, father of Malhun Hatun Geyhatu sends Kara Şaman Togay, son of Baycu Noyan, to eliminate both Osman's Kayı and Ömer's Bayındır, but after a series of conflicts between the two tribes, Togay fails and is killed by Osman.

Tekfur Nikola wants to marry Mari, sister of Mikhail Kosses, who in turn has fallen in love with Turgut Bey.

Meanwhile, a Vizier of the Seljuk Empire, Alemşah arrives to deal with Osman, thinking of him as a threat to his political ambitions.

Osman then has to face Nikola's mentor, the dangerous cult leader, Arius, who arrives in Söğüt in the disguise of a Sheikh.

Osman launches a series of conquests, conquering Bilecik, İnegöl and Yenisehir, executing Arius and Nikola.

With Sultan Mesud's blessing, Osman declares his principality to be an independent one and begins taxing Byzantine caravans passing through his territory.

Osman executes the Ilkhan Oljeitu's emissary, Akcelasun, prompting his twin brother Karacelasun (who soon becomes the governor of Konya) to come after him for revenge.

Later, Osman kidnaps the Byzantine princess Maria, who was to be married to Görklü Han, nephew of Emir Coban, Commander-in-Chief of the Ilkhanate.