|Yoritomo (Okada Masaki) in full battle armour, ep 46|
Starting in May 1180, episode 46 of ‘Taira no Kiyomori’ opened with another Genji/Yoritomo scene, following what happened in ep 45 where Yoritomo received a letter from Prince Mochihito requesting his help. Yoritomo still hesitated a bit. It took Hōjō Masako (Watanabe Anne) sternly reminding him of his life's purpose, as well as the support from Tō Kuro (Tsukamoto Takashi) and Hōjō Tokimasa (Endō Kenichi) before Yoritomo was convinced of his chance to win a war against Kiyomori. The letter-deliverer (whoever he was) also said that Minamoto no Yorimasa 100% supported Yoritomo. Finally, Yoritomo nodded, and thus began the Genpei War. Click here for the online version of ep 46. Below is the summary of TNK 46 from NHK World Premium (click this for the longer summary in Japanese).
Learning Prince Mochihito's plot, Kiyomori bursts in anger and captures Mochihito and his followers. While Kiyomori enforces the transfer of capital to Fukuhara for Emperor Antoku, Yoritomo finally rises up against the Taira family. Kiyomori has mixed feelings to learn of Yoritomo's move, but at the same time gets excited, thinking the time has finally come for the Taira and Minamoto families to fight for the summit over the nation's power. In September 1180, Kiyomori commands samurais across the country to defeat Yoritomo.
Back to Kyoto: it seems that Kiyomori knew of Yorimasa’s plot with Mochihito. Mochihito learned of the leak and then ran from his house to Uji (Yorimasa's hideout). But as they arrived at Uji, they were attacked by Kiyomori’s army. Yorimasa and his son escaped but his son then died. Yorimasa then committed seppuku (harakiri, or suicide in the face of defeat); the earliest seppuku ever recorded in history. According to Wiki, Mochihito escaped to Nara, but would be killed by Kiyomori’s army afterwards.