SeiUsa

SeiUsa is the Non-Binary ship between Kou Seiya and Usagi Tsukino from the Sailor Moon fandom.

Canon
Their first encounter was at the airport in episode 173, when Usagi is seeing Mamoru off, who was going to study abroad, and who had just proposed to her. Seiya had just landed and while wandering away from screaming fangirls, she walked past Usagi. While Usagi did not take notice of her, Seiya sensed a strong mysterious power surrounding Usagi.

The following day Seiya sees Usagi again at a park, though Usagi does not recognise Seiya, which surprises her, since she is the lead singer in the popular idol group “Three Light”s. Not long after, Seiya and the other Three Lights also attend the same school as Usagi. She sits behind Usagi in class and calls her a dumpling-head like Mamoru does. Usagi gets annoyed by Seiya’s constant teasing but the more time they spend together, the more their relationship develops and they become close in no time.

In episode 181, Seiya manages to ask Usagi to go out with her, without Usagi knowing it was actually a date. They have a fun playful time together at the zoo, and they even hug each other accidentally. Usagi’s heart is constantly pounding, and starts to realise Seiya might have something for her. Seiya advances towards her, and Usagi thinks too much into this. After realising she simply wanted to ask her to dance at the disco, she becomes slightly embarrassed. The lights go out due to a power outage and Seiya takes Usagi into her arms and tells her that everything would be alright.

This outage however was not an accident, but rather caused by Sailor Iron Mouse, whose target was Seiya. Amidst the battle, Seiya had transformed into Sailor Star Fighter without Usagi’s knowledge. In this form, Seiya realises that Eternal Sailor Moon (not Usagi) knows Seiya. Things are starting to get complicated, though in the end Seiya convinces herself Usagi cannot be Sailor Moon. Seiya then gives Usagi a little bear keychain as a thank you gift for spending the day with her.

In episode 187, the girls from Usagi’s school who formed the Seiya Fan Club were not impressed by Seiya and Usagi’s closeness. The leader of the fan club challenges Usagi and Seiya in a softball match, announcing that if their team loses, they must “break-up”. Usagi denies the fact they are together, but it did not seem to do any good. Usagi was pretty terrible at softball and Seiya patiently trained her to catch a ball all afternoon. Soon the night sky takes over and the two take a break while looking at the stars. Seiya tells Usagi that she believes in her and that she does not want to lose the game. The truth was, Usagi did not want to lose either and she tries her best which causes her team to win.

Things start to get bad in episode 188, when Aluminum Siren sets a trap for Usagi (after knowing her true identity as Sailor Moon). In order to protect her, Seiya transforms in front of her, revealing her secret identity. Usagi is shocked by the discovery but realises she has no other choice but to transform as well. Confusion, anger and sadness takes place, with the Sailor Starlights conflicting with the Senshi of the Solar System. Despite their differences, Seiya could not stop thinking about Usagi, she still believed in her. Usagi is also saddened because she does not want their friendship to end.

Seiya feels that Usagi is very important to her, even more important than her mission to find her princess (Princess Kakyuu). This often creates a quarrel among the Three lights, since she is the only one who trusted Usagi, constantly defending her.

In a later episode, Seiya discovers Sailor Moon was vulnerable to Tin Nyanko’s bazooka and she runs quickly to take the blast for her. Seiya is injured severely, losing consciousness and starts to bleed. Sailor Moon is horrified and becomes desperate to help her. The other Starlights appear and take her away angrily, warning Usagi to stay away from them. Their view on Sailor Moon turned into hatred as they blamed everything that happened to Seiya on Usagi. Their chances of seeing each other again were slim. Haruka and Michiru also warn Usagi to break all ties with Seiya.

Nevertheless, Seiya and Usagi try desperately to see each other. Usagi wanted to apologise for Seiya’s injury, and Seiya wanted to tell her everything about her mission. Seiya calls Usagi and invites her to one of her concerts, which was held in an Amusement Park. Usagi could not get a seat since the tickets were sold out, but notices a Ferris wheel and rides that. From such a high angle, she was able to see Seiya on stage clearly. Seiya was able to tell Usagi her story through her song, all about Sailor Galaxia and her mission to search for her Princess. Soon they were able to reach a mutual understanding.

As time passes, Usagi starts feeling more and more lonely without Mamoru’s presence. We soon learn that Mamoru had not replied to a single letter she had written to him. After a battle Sailor Moon and Sailor Star Fighter have against Tin Nyanko, it starts to rain. On the school roof-top, Usagi starts bursting into tears and speaks from her heart. She misses Mamoru dearly, and she cannot stand being alone anymore. These words hurt Seiya, and her anger shows... She was not angry with Usagi, but with herself. So Seiya kneels down and places her arms on Usagi’s shoulders. Looking into her eyes, Seiya asks if she was not good enough. Usagi realises at this moment what she means to Seiya.

Seiya and Usagi meet backstage before the Three Lights have their final concert. Seiya tells her that she is going to leave her after the concert. She confesses that she really likes her, and thinks about her all the time. Usagi does not know how to respond. Seiya tells her it is okay if she does not love her in return, and then she leans forward and gives her a kiss on the cheeks as tears stream down Usagi’s face.

During the final battle, Sailor Star Fighter constantly puts Sailor Moon’s life above her own, demonstrating that Usagi means everything to her.

After the battle, the Sailor Starlights and Princess Kakyuu leave earth and return to their home planet. Seiya says farewell to Usagi and tells her that she will never forget her. Usagi pretends to be oblivious about her own feelings. Seiya asks Mamoru to take care of Usagi and they depart. Usagi looks up to the stars and says farewell to Seiya, thanking her for everything.

Fanon
SeiUsa is one the most popular ships within the fandom. It is also commonly pitted against the MamoUsa ship. This ship is often supported by people who dislike Mamoru due to his actions in the later arcs of story, and also see Seiya as a more charismatic and loyal partner for Usagi. This pairing is also quite popular with the show's trans fans, among whom Stars allways being some of the most popular characters in the original anime.

This ship has a rather ambiguous gender nature, since if in the original manga Seiya was actually a a biological female character with an ambiguous male identity who could use magic to temporarily take on a male form, then after changes caused by the Japanese censorship in the original anime, he became a completely male character who only turned into a woman in order to disguise. Because of this, the ship is often perceived as a specific het ship, although in relation to the original canon it can also be called a femslash without much hesitation.

Fandom
FAN FICTION