Plot Analysis Summary
The single-season narrative follows an ancient warrior's awakening, adaptation to the present, and confrontation with the Efidolg invasion. Personal grief, hidden identities, and collective resistance converge in the final battle.
Story Structure — 5 Plot Phases
Cube Awakening
A laboratory attack releases a dormant samurai and brings a new geoframe threat into the modern world. The first battles establish the conflict and the difficulty of adapting to a changed era.
Key Events
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Laboratory Attack — The laboratory is attacked, and a student touches a mysterious cube while escaping.
Location: Kurobe Laboratory
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Black Shell Awakening — A samurai from the cube awakens and attempts to protect the student as a large geoframe emerges from Toyama Bay.
Location: Kurobe Laboratory
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Castle Ruins Battle — The Kuromukuro defeats an enemy geoframe, but the opposing machine escapes.
Location: castle ruins
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Modern World Disorientation — After learning how long he has been asleep, the awakened samurai is invited to live with a family and struggles with the modern world.
Location: a family home
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School Encounter — A student returns to school hoping for normality, but a glimpse of a new transfer student causes alarm.
Location: Tateyama High
River of Loss
Combat intensifies around the Yellow Crab mecha and the Jinzu River. A devastating death and the disappearance of classmates push the central student into emotional withdrawal.
Key Events
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School Encounter — A student returns to school hoping for normality, but a glimpse of a new transfer student causes alarm.
Location: Tateyama High
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Jinzu River Battle — The Kuromukuro confronts the Yellow Crab mecha while two classmates move toward the battle zone despite official restrictions.
Location: Jinzu River
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Loss of Fighting Will — After the Yellow Crab pilot takes his own life, the student loses the will to fight and learns that two classmates are missing.
Location: Tateyama High
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Search for Understanding — Friction over the invaders' demands leads the student to leave home, while the samurai searches for her and realizes how little he knows about her.
Location: Kurobe area
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Missing Pilot Crisis — An enormous enemy geoframe appears, but the research center lacks the power to oppose it while the student is missing.
Location: Kurobe area
Enemies and Memories
The research center captures and interrogates an enemy pilot, but the captive escapes. Training, school life, and battlefield encounters gradually expose links to a distant past.
Key Events
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Captured Pilot Interrogation — A captured pilot is questioned and explains that he came to find a particular object. The samurai appears to recognize him.
Location: research center
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Enemy Escape — The captured pilot escapes and restores his geoframe. The student encounters him while being ordered to deploy.
Location: research center
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Summer Combat Training — Summer vacation brings additional training, and the student improves more than expected. Another student expresses hope of becoming a pilot.
Location: Kurobe Laboratory
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Festival Defense — The Kuromukuro fights alongside the GAUS units and drives off a giant geoframe while preparations for a culture fair continue.
Location: local festival
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Princess Resemblance — The samurai is pierced by a woman whose face resembles his princess, but an unidentified figure intervenes before the attack is completed.
Location: battlefield
Approaching Mothership
Evacuation, personal departure pressure, and renewed enemy deployments widen the crisis. A dangerous mission is followed by the warning that the Efidolg mothership will land on Earth.
Key Events
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Population Evacuation — Residents begin evacuating, students transfer away from the school, and uncertainty spreads among those remaining.
Location: Kurobe area
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Pilot Departure Pressure — A pilot achieves strong results in a single-pilot GAUS, then learns that her parents expect her to leave Japan.
Location: Kurobe Laboratory
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Mothership Escalation — A comprehensive search begins for two missing enemy pilots, while the Efidolg mothership dispatches another geoframe.
Location: the sky above Kurobe
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Hot Springs Detour — Two central figures receive their salaries and decide to visit a hot spring together, prompting rumors at school.
Location: hot springs
Final Resistance
The research center is blockaded and the Efidolg threat is explained. A former enemy changes sides, a resistant power is revealed, and the decisive battle clarifies the samurai's path.
Key Events
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Mothership Landing Threat — After a dangerous encounter and a return to safety, the research center learns that the enemy mothership will soon land on Earth.
Location: research center
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Efidolg Blockade — The enemy blockades the research center, and the remaining group is informed about the Efidolg and a missing father.
Location: research center
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School Reprieve — A former enemy is brought to school, creating a stir among the remaining students. A film scenario is announced as complete.
Location: Tateyama High
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Former Enemy Defection — Seeking the truth, the former enemy turns against her previous comrades as everyone prepares for the decisive battle.
Location: Kurobe Laboratory
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Resistant Power Revealed — The samurai and an enemy figure learn about a power capable of resisting the enemy, while students wait anxiously for the others to return.
Location: Kurobe Laboratory
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Final Path Forward — Through the fight with the Efidolg, the characters move closer to their aims, and the samurai discovers the path he must follow.
Location: Kurobe area