As of July 2026, Scarlet Nexus Season 1 aired in 2021 with 26 episodes — streaming now on Crunchyroll. Full episode guide and where to watch below.

Scarlet Nexus Season 1 poster

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Scarlet Nexus Season 1

2021 26 Episodes Animation · Action & Adventure ⭐ 7/10

Scarlet Nexus Season 1 has built a real following on and among viewers who want their sci-fi to think as hard as it looks. The show says what it needs to say in a single season, no filler. 64 viewers have already rated it on TMDB — the kind of consensus that does not happen by accident. Junya Enoki sets the tone, and the world-building does the rest. Put it on tonight and see for yourself.

Scarlet Nexus Season 1 arrived without much fanfare and built its audience the hard way — through word of mouth. What makes Scarlet Nexus Season 1 work is that the ideas never crowd out the people having them. Season 1 of Scarlet Nexus includes 26 episodes. It aired from July 2021 to December 2021. This season stars Junya Enoki, Asami Seto and Tomomi Mineuchi. Junya Enoki and Asami Seto lead a cast that brings real weight to the material. It was aired in 2021. The world-building is meticulous enough to sustain multiple rewatches, with details early on that only make sense later. It knows exactly what it is, and does not try to be anything else.

Scarlet Nexus Season 1 is satisfying on multiple levels — something to watch and something to think about after. If you have run out of similar titles to watch, this is a strong next pick. Short enough to finish in a weekend, substantial enough to feel satisfying. Watch for Junya Enoki in particular — the performance elevates the material. Satisfying on multiple levels.

📡 Where to Watch Scarlet Nexus Season 1

🇦🇺 Australia

Crunchyroll Amazon Channel

🇺🇸 United States

Crunchyroll Amazon Channel

🇬🇧 United Kingdom

Crunchyroll Amazon Channel

🇨🇦 Canada

Crunchyroll Amazon Channel

🇳🇿 New Zealand

Crunchyroll Amazon Channel

🎬 Scarlet Nexus Season 1 — Episode Guide

Scarlet Psionics

Yuito and Nagi are inducted into the Scarlet Guardians and meet their team members, each with their own psionic power. Soon after, they join the battle against invading mutants known as Others, but could there be more to the invasion than meets the eye?

Scarlet Guardians

Yuito's memory of his childhood savior returns. While off duty, Yuito and Nagi run into Naomi and Kasane. Something is afoot in Seiran, but is it related to Karen's agenda? The Seto and Kyoka platoons train, and then scramble to intercept the Others.

Something goes horribly wrong with Naomi, leaving her comrades dazed and confused. It's clear there is more to it when they're told to keep quiet. Kasane divulges a shocking secret to Yuito, and the Seto and Kyoka platoons face an unexpected enemy.

Karen's machinations lead to a battle between comrades until a new threat arrives, claiming all around it. Yuito and company lick their wounds as they learn about Karen's motives. Others swarm into Suoh, and Kasane and company awake in a strange place.

As Karen's revolt gathers steam, Yuito and forces loyal to New Himuka are hard-pressed. Fubuki takes command of a band of loyalists and orders Yuito to check that his father is safe. Karen publically reveals a motive, and Yuito has a shocking encounter.

A Doomed Tomorrow

Kasane and company wake to a shocking reality and strange encounters. Kasane learns about the void in the sky and a way to stop it. Yuito and Kasane clash after she finds out what is behind Karen's revolt. Kasane heads to Seiran with other OSF members.

The Hunt for Nagi

Friends become enemies as the OSF splits in two. Yuito receives a promotion, but why can't he remember? Karen creates a new Seiran OSF platoon and tells Kasane they have Naomi in their care. The hunt for Nagi is on as Yuito gains fresh intel.

The Hospital's Secrets

The hunt for Nagi continues. Yuito's platoon is ambushed but makes a narrow escape. Fubuki and Luka reveal the hospital's secrets and the dark truths behind them. Kasane's platoon searches for Naomi. Karen offers to help with Naomi's condition.

A Dubious Wonder Drug

Fubuki reveals his mindset to Yuito. After approaching Kaito, Fubuki's plan takes shape. Yuito's ailment worsens, and he tries the drug he was prescribed. His platoon discovers a secret manufacturing plant and has a run-in with Kasane's platoon.

The Rebel Yuito

Fubuki puts his plan into action. Yuito and his platoon set out to recover Nagi's memory data. Kasane's platoon learns more about the Kunad Gate and her encounter with future Yuito. Yuito learns a shocking truth from his past. Togetsu comes into play.

With the government in hot pursuit, Yuito ponders his next move. Yuito's platoon learns that he was once a dud and that Fubuki is missing. Yuito and Kasane separately decide to go to Togetsu with their platoons, but who or what will they find there?

The Moon's Secrets

Yuito's platoon accesses information only available in Togetsu. Kasane has a flashback to a forgotten past and encounters an unlikely savior within the Togetsu compound. Yuito's platoon sets out to access Togetsu's other computer system.

The Design Children

Yuito and Kasane try to flee Togetsu with their platoons. Kyoka attempts to thwart Kasane's escape. Yuito's platoon learns of Kasane's past and why she tried to kill him. Kagero's past comes to light, and he confirms Togetsu's story about the moon.

A 2,000-Year Ambition

Kagero provides more info on the Ark mission and explains the Extinction Belt's origin. A new threat stalks the platoons, but their escape route is even more dangerous. They must decide their next step once Togetsu's ultimate objective is revealed.

Nagi confronts Yuito's platoon. Arashi has a plan. Yuito's brother tells him the truth about their family. Yuito prepares to expose New Himuka's agenda. Kasane's platoon receives shocking news as they prepare to approach Seiran's leadership.

Naomi and Alice

Suoh prepares to deploy Naomi, Alice, and the rest of the human-derived Others. Kasane's platoon rushes to stop them. Yuito's platoon ventures into Arahabaki to broadcast the secretly recorded video to the public. Karen uses his Brain Eater power.

Arahabaki's Trap

After stealing Kasane's power, Karen sets his sights on Yuito's. Yuito's broadcast triggers unrest. Yuito's platoon hatches a plan to save him. The New Himukan government orders a lockdown. Fubuki escapes, but will he reach Yuito in time?

Fubuki and Yuito's platoon exchange info. Fubuki recounts the past he, Alice, and Karen share and explains what happened to Alice and why Karen is taking desperate measures. Yuito's platoon forms a plan to stop Togetsu. Kagero makes a shocking confession.

Kagero's Confession

Kagero explains what's behind his actions. Yuito and company learn what really happened the day Chairman Sumeragi was killed. Yuito and Kagero have a reckoning. Yuito and Kasane's platoons infiltrate Togetsu again, but little do they know what's in store.

Yuito and Kasane learn about their mother's past as their platoons continue their mission to shut down BABE. Kasane travels to the past to meet with someone who knows about the Red Strings, but when she returns to the present, she's not alone!

🎭 Cast of Scarlet Nexus Season 1

Junya Enoki

Yuito Sumeragi (voice)

Asami Seto

Kasane Randall (voice)

Tomomi Mineuchi

Tomomi Mineuchi

Hanabi Ichijo (voice)

Marika Kouno

Tsugumi Nazar (voice)

Ryota Takeuchi

Gemma Garrison (voice)

Chinatsu Akasaki

Chinatsu Akasaki

Luka Travers (voice)

Kengo Kawanishi

Kengo Kawanishi

Shiden Ritter (voice)

Yui Horie

Yui Horie

Arashi Spring (voice)

Yumi Hara

Yumi Hara

Kyoka Eden (voice)

Daisuke Namikawa

Daisuke Namikawa

Kagero Donne (voice)

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