Why did Naotora's rival Masatsugu Ono's seizure of power end in just 34 days?

Ono Masatsugu was a Sengoku warlord who became a hot topic in living rooms across Japan after being played by Takahashi Issei in the historical drama "Onna Joushu Naotora." Although he longed for Naotora, his wish was not fulfilled, and in the end he was stabbed in the chest by Naotora, killing him. The shocking ending left viewers completely stunned, and at the same time, it raised the question, "Did the real Ono Masatsugu die like that?" So, w…