GureShin

GureShin is the slash ship between Guren Ichinose and Shinya Hiiragi from the Seraph of the End fandom.

Canon
Shinya and Guren are trusted comrades who can count on one another on battlefield. Shinya teases Guren constantly while Guren gets annoyed by it.

Catastrophe at Sixteen Light Novels
Guren first met Shinya when they were 15-year-olds while attending the same high school. Instead of sitting in front of the class, Shinya intentionally chose to sit in the back next to Guren and told him that he wanted to become friends with him. He also made it clear that he hated the Hiiragi family just as much as he did, and hoped that once they met they'd be able to "stir some trouble up together", but Guren refuses.

From that on Shinya keeps observing Guren and talking to him. When they are observing the Hyakuya Sect together, Shinya saves Guren's life from a vampire that attacks them. Guren admits that he can trust Shinya a little now.

As the novels continued Guren and Shinya slowly become friends. When Guren attacks the school, possessed by his demon, Shinya holds Guren for more than one hour until Guren is no longer possessed.

During the trip to Nagoya Guren and his friends stay in a love hotel. As Shinya and Guren enter the love hotel together they are mistaken for a couple.

During their last fight against Mahiru, she kills Shinya and Guren's other friends. Guren is so desperate about Shinya's death that he accepts to trigger the "Seraph of the End" experiment, which will revive Shinya and his friends, but will only give them 10 more years. Guren also takes the sin upon himself that he thereby causes the apocalypse and kills millions of people, just to be with Shinya again.

Resurrection at Nineteen Light Novels
Having revived Shinya and his friends, Guren continues to live with the guilt of having caused the apocalypse.

When Shinya takes him for a ride on his motorcycle Guren leans against Shinya's back and enhances his demonic powers to be able to hear his heart beat. Guren starts counting his heart beats, just to be reminded that Shinya is still alive and that he made the right decision reviving him from the dead.

Vampire Reign Manga
Guren had distanced himself from his friends to keep them save, as they will die if they learn about their deaths. Nevertheless he gathers his friends, including Shinya, to help him.

Yet Guren betrays them in chapter 83 and becomes a full demon. Shinya wants to stop him. He begs his demon to give him more power which results in an internal monologue between Shinya and his demon. Shinya's demon, Byakkomaru, tells Shinya that he acts if he was in love with Guren. Shinya just laughs and replies with something that can roughly be translated to it's just longing/admiration. But his body language shows how much he cares about Guren. He puts his desire into one final sentence: I will never give up on Guren.

Chapter 83 indicates that Shinya is in love with Guren.

In chapter 99 Guren cries for the first time in the Vampire Reign Manga as he reveals that he thinks he was supposed to die with Shinya back then, referring to their last converstaion before Shinya died. Shinya told him not to become a demon and stay human, but Guren was so desperate that he ignored Shinya's directive. The scene emphazies their deep connection that is reciprocated by Guren.

Fanon
The best friends to lovers trope is one of the major reasons why fans are drawn to this ship, and another is the unique ways in which they show how much they care for one another - Shinya with his playful teasing and Guren with his seemingly harsh words.

Guren's past relationship with Mahiru Hiiragi is featured in some GureShin fanfics, often with Shinya helping Guren recover from his heartbreak before they eventually realize that throughout that process, they have fallen in love with each other.

In some fanfiction that includes both this ship and MikaYuu, Guren and Shinya tend to play the role of supportive parents to Mika and Yuu as the younger pair's relationship gradually develops into a romantic one. Having been best friends ever since they were in high school, they have grown quite close over the years.

On AO3, GureShin is the most written ship for both Guren and Shinya. It is the second most written ship within the Seraph of the End tag.

Fandom
FAN FICTION
 * Shinya/Guren tag on FanFiction.net
 * Shinya/Guren tag on FanFiction.net

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