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Eureka Seven, known in Japan as Psalms of Planets Eureka Seven, is a mecha anime TV series by Bones. Eureka Seven tells the story of Renton Thurston and the outlaw group Gekkostate, his relationship with the enigmatic mecha pilot Eureka, and the mystery of the Coralians.

fly away

Eureka is a pale young girl with turquoise hair and lavender eyes and is a pilot of the Nirvash typeZERO. She treats Nirvash not like a mere machine, but as a living being, with consciousness and feelings. However, she can seem distant and awkward to other people - she has trouble communicating with other humans and understanding their feelings. She tends to appear randomly next to people, startling them at times. Initially in the anime, she suffers from frequent headaches; these stop later on, seemingly due to the presence of Renton Thurston. She is the adoptive mother of Maurice, Maeter, and Linck, but is often unsure of her role as a mother, and often asks Renton how she should scold them, and if she is a good mother.

Spoiler - Warning!

It is later revealed that she is actually a Coralian in human form, sent by the sentient Scub Coral to understand and communicate with humans. The Scub Coral, who had become the largest living mass on Earth, longed to connect with humanity, and created two human form Coralians to reach this goal. Sakuya came first, and she foretold of Eureka's arrival. Eureka was meant to be a blank slate, so that she would be shaped by her experiences with humanity, and bring these experiences to the Coralians. She herself is not aware of her past nor does she have any knowledge of the Coralians even though she's one herself. She is the adoptive mother of Maurice, Maeter and Linck, whose families she killed while in the SOF. Her lack of understanding of her own feelings and the methods by which humans demonstrate and share feelings creates many complications at times whenever Renton tries to bond with her. After she entered the Coralian with Renton, she began to suffer at a subconscious level as a side effect of her proximity to the old dig site FAC51, and the large amount of Scub within. She becomes constantly fatigued and seems to be in either despair or depression. Her negative feelings are further increased as she becomes convinced that the Nirvash no longer wants her as its pilot in favor of Renton. She tries to make things up with Renton, but is rebuffed.

As an attempt to deny the emotional changes in herself and her relationship with the Nirvash, she tries to return things to the way they were when she met Renton, and removes Renton's Compac drive from the Nirvash. She falls asleep and the Nirvash, operating on its own, drives her deep into the mine to the face of the Scub. She is seemingly compelled to walk into the rockface, where the Scub reaches out and engulfs her. Renton becomes worried and rushes out to find her. From her point of view, she feels that she is melting away and wishes to be rescued. Just as she is about to melt, Renton is perceived to catch her in his hand. He pulls her out of the rockface and causes another trapar event in the process of using the Nirvash to return her to the Gekko.

As an indirect result of this incident and Holland's apparent lack of urgency about helping her, Renton runs away from the Gekko. She is still very weak, and the crew conspires to prevent her from discovering that he is gone, especially as she seems to be becoming interested in him. After she discovers this, she confronts Holland who basically states that Eureka is more important than Renton, which she denies. She dresses in the clothes given to him for the Ramen prank, and begins to do the jobs that had been assigned to him, "because he is not here". As she begins to confront Renton's importance to her, Mischa informs Holland that the Nirvash needs Eureka and Renton to function properly.

Eureka attempts several times to operate the Nirvash to go find Renton, and fails badly. The Nirvash doesn't seem to agree even when she asks the Nirvash if she misses Renton too, and doesn't she want to go find him. Confronted with the depth of her apparent feelings for Renton, and with her total ineffectiveness with the Nirvash, Holland promises to bring Renton back to her, and leaves to find him, only to return empty-handed after discovering a trap aimed at the Gekko.

Her faith in the perfect sore of Holland's word (to her, at least) shattered, and realizing how much Renton has come to mean to her, she borrows a board and leaves to find him, ironically just as he is returning to protect her by warning of the threat to the Gekko. Eventually the situation is resolved, and Renton rescues her again. After this, they effectively become a couple, although neither one really knows how to interact with the other.

She discovers a desire to make Renton happy with her, which leads to a disastrous experiment with makeup, and a deeper trust in Renton, as well as a label for the emotion she feels.

Partially prompted by Renton's reaction to the deaths of Charles and Ray, Eureka's feelings start to allow her to understand guilt and regret as her emotions connect with her memories of the massacre at Ciudades del Cielo. She knows that her past actions led to the deaths of many people, and because she is beginning to understand the human impact of killing and loss, she loses confidence in herself and no longer desires to fight with Nirvash. Renton also believes taking lives is wrong so they both begin fighting to only disable enemy units. Renton constantly consoles her as she's trying to deal with her past actions and facing responsibility for the Vodarac people.

After she is revealed as a Coralian, Renton does not reject her as she feared but rather accepts her for who she is, not what she is, which results in a further expansion of her understanding of human emotions.

Sakuya and Eureka are very similar to each other and Sakuya helped restore most of Eureka's superficial damage, but Eureka wishes to keep her scars to remind her of her struggles. She and Renton enter the Coralian realm hoping to change humanity's fate.

After Eureka, Renton, and the children reached Earth, they crash landed on a coastline. Being frustrated for a while unable to figure out their purpose, they resided near the coastline for a while eating the local vegetation. Eureka's scars were a reaction towards the Command Center and Coralian physical attributes began showing throughout her body. She became more and more ashamed of her form as she worried that Renton wouldn't approve or even reject her form. At one point, Renton chased Eureka into the woods, attempting to cover the green on her arm, and even going as far as to take a rock and damage his own arm with it. Maurice also followed, carrying a gun, who he threatened to shoot Renton with but Eureka stopped him. Afterwards, Renton fell into a high fever, and the kids and Eureka had to take care of him. During Renton's worst moment, she grew wing-like structures upon her back (the structures are referred to simply as wings) and her arm became green and pink of Coralian design. After Renton recovered, Eureka was happy to know Renton liked her wings. After wandering the coast Renton spotted his big sister and ran after her. Eureka and the kids went after Renton and were lost in the great library created by the Scub. Adroc Thurston appeared before Eureka and looked after the children and Eureka before Renton returned. After Renton spoke to Diane about the coming attack on the Command Cluster, Anemone appeared.

When Anemone attacked the Scub Command, Eureka and Renton engage TheEND to protect the Scub. After hearing the sadness and pain of Anemone's words, they decided to save her. After Anemone was saved by Dominic's appearance, all was well until Dewey fired his satellite cannon. The Command Center was blown away, TheEND was destroyed when it moved of its own accord to shield Dominic and Anemone from the blast, and the Nirvash barely managed to escape. Immediately afterwards, the Gekko and Dewey's flagship arrived at the remains of the Control Cluster and Holland boarded Dewey's ship in order to finally put an end to his brother's madness. However, in a surprising move Dewey killed himself, activating the collar-like devices that Eureka and Anemone had always worn. Eureka felt a sudden change in her body and, realizing her time with Renton was over, she apologized for a failed dream together and transformed into a Coralian event.

Inside the Coralian event Eureka was in an artificially created plain, seemingly not on Earth as the planet could be seen in the sky. Renton, enraged at losing Eureka after having gone through so much with her, begged the Nirvash to help him go to her. The Nirvash reacted by transforming into its apparent true form, a smoother, less angular, white and green version of itself with large, round limbs, a differently shaped head, and no seats or board; it flew by channeling trapars through its hands. Instead of piloting with controls, Renton went inside the Nirvash and stood on a large green platform; while inside the Nirvash mimicked his every movement. They broke through the hull of the Gekko and took off to where Eureka was. Smashing into the side of the sphere-shaped space, Renton's feelings for Eureka enabled him (in the Nirvash) to rip open the space and go to Eureka inside. Renton reminded her of his promise to always protect her and be at her side, and they finally kissed. Nirvash pushed open the Coralian zone and ejected Renton and Eureka, bidding them farewell. A year later, in the last episode, the Thurston family register lists her and the three kids as the wife and children of Renton Thurston. The children and Axel eagerly await their return. The couple were seen together near a lake. In the manga, she disappears with the Scub, together with all the other Coralians. But it is implied that when the Scub is restored she will return to Renton and the children.