Hayaprez

Hayaprez is the het ship between Ai Hayasaka and Miyuki Shirogane from the Kaguya-sama: Love Is War fandom.

Canon
Hayasaka is a student at Shuchi'in Academy who works as Kaguya Shinomiya's maid. Throughout most of the series, Hayasaka acts as Kaguya's support in getting her crush, Miyuki Shirogane, to confess to her. Despite Shirogane's rejection of Hayasaka in favor of Kaguya, Hayasaka is implied to have some attraction to him, and occasionally expresses her anger towards Kaguya by attempting to sway him towards her. Nonetheless, Hayasaka cares deeply for both Kaguya and Shirogane, and is thus one of the strongest supporters of their relationship.

Shirogane and Hayasaka first meet when Kaguya gets sick and Shirogane comes to visit her. Hayasaka uses an alias of Hayasaca A. Smithee and fakes a foreign accent in order to hide her true identity from Shirogane. As a test of Shirogane's character, Hayasaka reminds him that Kaguya won't remember anything that happens, before shutting them in a room together. Shirogane, however, does not act on this opportunity, only sleeping beside Kaguya when she deliriously pulls him into bed with her. Hayasaka is later seen inspecting the bed for signs of misbehavior from Shirogane.

As the series progresses without a confession from either Shirogane or Kaguya, Hayasaka begins to get frustrated with Kaguya's antics. Hayasaka makes a bet that she can seduce Shirogane easily, which Kaguya agrees to, in hopes Shirogane will prove to only have eyes for her. Hayasaka disguises herself and bumps into Shirogane, where she shows interest in his hobbies, asks him for advice, falls asleep next to him, and offers a "no strings attached" relationship. Much to Hayasaka's embarrassment, Shirogane turns her down, indirectly citing his loyalty towards and feelings for Kaguya. Kaguya is satisfied by this outcome, but Hayasaka is depressed that she failed to make him fall for her. Not long after, Hayasaka gets her revenge by creating a scene out of Shirogane requesting Kaguya be his election campaign manager.

After Shirogane is invited by his friends to Karaoke, unaware that that he is in fact being brought to a mixer party, Kaguya tells Hayasaka to go to keep him away from the other girls. Hayasaka, however, attempts once more to seduce Shirogane. The two chat, with Hayasaka revealing to Shirogane that she believes people can only be loved if they put on a disguise. When another guy begins to flirt with Hayasaka in an invasive manner, Shirogane takes Hayasaka to a private room. Kaguya panics, fearing that Hayasaka has succeeded in seducing Shirogane, and attempts to intervene without Shirogane knowing. Despite hearing suggestive noises and believing that the two were engaged in sexual intercourse, Kaguya discovers that these sounds were in fact merely Hayasaka's reaction to Shirogane's terrible karaoke skills.

Shirogane and Hayasaka do exchange phone numbers and begin to text regularly with one another. Miyuki's sister, Kei, claims that Miyuki often stops studying to respond to Hayasaka's texts. This leads both Kei and Chika to mistakenly assume that Miyuki has feelings for Hayasaka, further worrying Kaguya. Kaguya notes that Shirogane and her rarely text by comparison. In this, Shirogane and Hayasaka's friendship acts as a contrast to Shirogane and Kaguya, showing how their constant mind-games is preventing them from getting closer to one another.

After taking rap lessons from Chika (who mistakenly believes Shirogane is attempting to confess his affections for Hayasaka, and that Hayasaka is a man) Shirogane dedicates a rap to Hayasaka. He rips apart Hayasaka's belief that she has to put on a mask to be loved. Impressed by his improved singing skills and moved by his words, Hayasaka responds with an honest rap of her own. She admits to Shirogane, Chika, and Kaguya that she is tired of her job, resenting Kaguya for holding her back from her own life. She says she wants to be free to have her own friends and her own love story. Shirogane congratulates her with a fist-bump. Kaguya does a rap of her own about how she feels left out between Shirogane and Hayasaka, asking Hayasaka if she likes Shirogane. Hayasaka responds by saying that it all starts with friendship. Thus, the worry, imagined or real, that Hayasaka might in fact be interested in dating Miyuki further pushes Kaguya towards making her feelings known to him. It is not long after this encounter that Kaguya finally admits to Hayasaka and herself that she is in love with Shirogane. Hayasaka helps Kaguya in her plan to confess to Shirogane.

During a school trip, Shirogane confronts Hayasaka about her true identity. He descovers her in the lift. She admits to all of her lies and her true connection to the Shinomiya family. The next day, Hayasaka meets up with Shirogane's friend group, and once they're left alone, tells him about the missions she was given. When Kaguya's brother's men start chasing Hayasaka, Shirogane helps her escape, all while giving her a lecture about the importance of having friends in your life. The two escape together on a scooter. With Kaguya's permission, Hayasaka gives Miyuki chocolate on Valentine's Day as thanks for helping her during her confrontation with Kaguya's brother.

In another chapter, the two are hanging out and have a friendly baseball competition with Yu Ishigami and Maki Shijo after school. She cheers for him while playing baseball while Maki and ishigami friendly tease him.

Hayasaka helps Miyuki discover that he doesn't see well and that he needs glasses. Hayasaka tries to put the eye contacts on for him, and she teases him by putting herself on him and approaching his face, saying that many people have a fetish of licking eyeballs. She asks him if he wants to try. Miyuki is embarrassed by this and refuses, to which Hayasaka says she was only joking.

Later, Unyo asks Miyuki to help him track down Hayasaka, but Miyuki refuses to help out of a desire to protect Hayasaka. In chapter 242, with the war between Shijo and Shinomiya, Miyuki is in danger because Oko Shinomiya could kidnap him to blackmail Kaguya. So Hayasaka becomes his bodyguard to keep him safe by teaming up with Unyo. Unyo says that Hayasaka did that because Miyuki is "very important to her", with a mischievous smile. Hayasaka blushes a lot and says that Shinomiya really likes to dig deep into certain matters, implying that probably she feels something for Miyuki. Hayasaka moves to Miyuki's house to protect him, something that excites her. Miyuki, by contrast is worried is worried about how to explain this to his family. Hayasaka says that Miyuki could tell them that he broke up with Kaguya and she is his new girlfriend, but he refuses.

Once Hayasaka moves to Miyuki's house, Hayasaka cosplays on Miyuki’s bed, much to Miyuki's embarrassment. When she cosplays as a maid, Miyuki covers his eyes, saying "I can't do it." Hayasaka enjoys his discomfort, saying that Miyuki likes to dominate his partner. Hayasaka then puts cat ears on, causing Miyuki to blush and say, "You're invincible. " Hayasaka lives at Miyuki's house for a while, and the two are often seen together.

When Kaguya's family forces her to break-up with Shirogane, Hayasaka is devastated and suspects Shirogane plans to give Kaguya up. Shirogane makes clear he has no intention of this, and asks Hayasaka to help him free Kaguya from her family, which Hayasaka agrees to.

Shirogane later moves to America to attend Stanford. Hayasaka cries as she says goodbye to him, promising to contact him soon. Their final interaction is in a flash-forward taking place a few years after the ending, where the group reunites for drinks, and Kaguya and Shirogane have since married.

Fanon
The ship first became popular after Hayasaka attempted to seduce Shirogane as part of her bet with Kaguya. It was further fueled with several chapters of the fan-made but officially presented doujin showing an AU where the two get together. Its main rival ships are Kaguprez and Fujisaka.

They're usually shipped because of their similarities, and because Miyuki is the first person Hayasaka truly begins to open up to. Hayasaka is also the girl Shirogane is closest to after Kaguya, and their relationship receives a good deal of emphasis.

The fan fictions and fan arts that do exist usually focus on the chapters in which Hayasaka seduces President, or on their relationship from one of Official Doujin's alternate universes.

Fandom
WIKI
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Trivia

 * There is a fan-made doujin of the original manga written and illustrated by a different author. In a few chapters which focused on a "kindergarten AU," Hayasaka and Miyuki ended up getting engaged in an alternate universe where they both worked as kindergarten teachers while the rest of the cast were kids.
 * The author said that since he created the character of Hayasaka, he had in mind to get her this close relationship with Miyuki.