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Watching earlier episodes in season 1 helps you follow the plot and character arcs leading into this episode.

Watch NIPPON SANGOKU: The Three Nations of the Crimson Sun Season 1 Episode 4 Online

Q: Where can I watch “NIPPON SANGOKU: The Three Nations of the Crimson Sun” Season 1 Episode 4 online?

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“The Seii Coup” — Watch "NIPPON SANGOKU: The Three Nations of the Crimson Sun" Season 1 Episode 4 online in HD for free. Check streaming providers, cast, and episode details.

Apr 26, 2026 Season 1 Episode 4 26 min TV-MA

7.0 ★ ★ ★ ★ ★

2 votes

NIPPON SANGOKU: The Three Nations of the Crimson Sun Season 1

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Season 1 Episode 4 — Aired on Apr 26, 2026 • runs about 26 minutes.

Notable cast/guest names in this episode include Kensho Ono, Jun Fukuyama, Takashi Nagasako, Asami Seto.

This page includes 4 official still(s) (when available) plus legal availability links.

Looking for “watch NIPPON SANGOKU: The Three Nations of the Crimson Sun Season 1 Episode 4 online”? This is a legal-only guide with synopsis, stills, and navigation for this season.

Synopsis

Three years after passing the Toryumon, Aoteru is working hard under Ryumon to perform his duties to their fullest. Meanwhile, Yamato sends a demand for unconditional surrender to the neighboring nation of Seii, which has been unstable due to the harsh winter conditions. In Seii, the embers of rebellion are quietly stoked.