Hayaprez

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

Canon
Despite being fellow schoolmates in their second year at Shuchi'in Academy, Ai Hayasaka and Miyuki Shirogane rarely interact in the main series. However, they still share a fair number of interactions together.

Throughout most of the series, Hayasaka helps her mistress, Kaguya Shinomiya, to get her crush, Miyuki Shirogane, to confess to her. Early in the series, Shirogane has no idea that Hayasaka works as Kaguya's maid.

When Kaguya gets sick and the Student Council President visits her, Hayasaka uses an alias of Hayasaca A. Smithee and fakes a foreign accent in order to hide her true identity from Shirogane. She then tests his will by reminding him that Kaguya is sick and thus won't remember what happened, as well as saying that the walls in her house are sound-proof; but reminds him not to do anything weird.

After Ai once notes no progress in Kaguya and Miyuki's relationship, Shinomiya asks her to attempt to seduce Shirogane to prove her point that he only has his eyes for her. To do so, Hayasaka uses her identity as Hayasaca A. Smithee to "accidentally" meet with Shirogane. After he recognizes her as Kaguya's maid, the two spend some time together. During that time, Hayasaka uses several psychological tricks to make the Presiddent interested in her, such as showing interest in his hobbies, asking him for advice, relating to him on being a hard-working student, pretending to fall asleep next to him, and offering to be his part-time girlfriend. Nonetheless, all her methods fail and Shirogane does indeed remain loyal to Shinomiya and rejects Hayasaca, much to her embarrassement.

Soon after, being mad for the embarrassement and being involved in something she didn't want to take part in, when the President wants to talk with Shonimiya in private, to get her help in the election campaign, Hayasaka, in her gal persona, announces it loudly in front of the whole class, creating a peer pressure scenario for Miyuki and Kaguya.

During the Mixer arc, Hayasaka once more attempts to seduce Miyuki under her Hayasaca disguise after Kaguya had told her to go to the mixer party that the President was attending, to make sure other girls stay away from him. After she meets with Shirogane and the rejection is revealed, Miyuki's friends leave the two of them alone. They spend the time together, with Hayasaca singing karaoke and the two talking about how one can only be loved if they put on a disguise. When another guy approaches and flirts with her, Shirogane takes her away to a private room in the karaoke club. After suspecting Hayasaka may have succeeded in seducing Miyuki this time, Kaguya decides to bust them together. After hearing suggestive lines from inside the room, Shinomiya enters, only to find out that Hayasaka's been tired from Shirogane's horrible karaoke singing.

The two don't have any major interactions together again until the School Trip arc. At one point, Shirogane confronts Hayasaka about her true identity. She admits to all of her lies and her true connection to the Shinomiya family. On 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. After the encounter with her brother and a meaningful conversation with Hayasaka, Kaguya thanks Miyuki for helping them, to which Shirogane realizes that he didn't get to do anything during the encounter itself, aside from spice spraying one of the guards.

Meanwhile, several chapters of an Official Doujin focus on an alternate universe in which Miyuki Shirogane and Ai Hayasaka are kindergarten teachers while the rest of the cast are their students. Mostly with the help of little Kaguya, the two's relationship progresses over the several chapters and they eventually end up being engaged and living together.

Fanon
The ship sailed as a result of the chapters in which Hayasaka was told to seduce Shirogane. Those who prefer rarepairs instantly took a liking to this ship. It was further fueled with several chapters of the Official Doujin focusing on their relationship in an alternate universe. Its main rival ships are Kaguprez and Fujisaka.

As a result of the two rarely interacting in canon and Miyuki's canon relationship with Kaguya, this ship isn't too popular. As such, it usually loses in popularity to Kaguprez and Fujisaka. Nonetheless, it gained some more popularity with the anime adapting one chapter in which Hayasaka tries to seduce Shirogane. It's also still among the most popular ships for both characters included, usually taking second or third place.

Since it's a relatively minor ship, there isn't much fan art about it. This is also the case due to anime-only fans not being too familiar with the ship. However, the fan fictions and fan arts that do exist usually focus on the chapters in which Hayasake seduces President or on their relationship from one of Official Doujin's alternate universes.

Fandom
WIKI
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Trivia

 * So far, this is the only relationship in Kaguya-sama: Love is War to be fanon in the main series but canon in an alternate universe.