SaneGiyuu

SaneGiyuu is the slash ship between Sanemi Shinazugawa and Giyuu Tomioka from the Demon Slayer fandom.

Canon
Sanemi and Giyuu are the Wind Pillar and Water Pillar respectively of the Demon Slaying Corps.

They are polar opposites personality-wise, but they share many similarities despite so. Both have lost their only family to demons and a best friend who died during a team battle against a demon. Due to their personality differences, they get along quite badly in most of the series and only during/after the final battle do they get along.

They are first seen interacting after the battle against lower moon 5, when Tanjirou and Nezuko's fate are decided. When Tanjirou defends Nezuko and is about to attack Sanemi, Giyuu interferes and yells "Oyakata-sama" is about to arrive. This distracts Sanemi and this allows Tanjirou to get a hit on Sanemi. After hearing Tanjirou, Urokodaki and Giyuu will commit suicide if Nezuko hurts anyone, Sanemi says they can die for all he cares but that doesn't guarantee anything. In the preview after the ending of episode 22, the pillars are commenting on the fact that Sanemi got hit by a rookie, to which he responds that he would've dodged it, had Giyuu not gotten in the way. Giyuu replies to this: "Excuses, excuses." annoying Sanemi. It's a long time until they interact again, after the fight against upper moon 4 & 5. The pillars are summoned and they get informed about how to get the Demon Slayer Mark. When Sanemi says it's really that simple, Giyuu responds: "I envy those simpletons who can say this is simple." which pisses Sanemi and Obanai off. When Giyuu says that he'll leave now that Amane is gone. Sanemi tells him to wait, because they have to make their future plans. After Giyuu makes walks to the door to leave, Sanemi tells him to wait and after being asked by Shinobu to explain, Giyuu says that he's not like them. Sanemi gets angry at this and says he's pissing him off and asks if he's making fun of them. Sanemi stands up and goes to Giyuu but before anything can happen, Gyomei interrupts. In this case, Sanemi is angry because he (like everyone else) is misunderstanding what Giyuu means. Sanemi thinks Giyuu thinks himself above the other pillars, while Giyuu actually means he's not worthy of being a pillar. This misunderstanding is mainly because Giyuu is hard to read and looking at his facial expressions would make you think he's arrogant. When Tanjirou goes to Giyuu's estate to train, he walks in on Sanemi and Giyuu fighting. When the fights begins, Sanemi is already looking angry. During the short fight, Sanemi says: "Oraoraa!! What wrong?! You're no different from the rest of us!" because he is still under the impression Giyuu thinks himself superior. The fight ends when both of their swords break, however Sanemi says it's time to pummel each other to death with their fists. Tanjirou interrupts then and eventually reveals that Sanemi likes ohagi and Giyuu is surprised by this. After Sanemi has knocked Tanjirou out, Giyuu says to Tanjirou that Sanemi stormed away and that they weren't actually fighting but taking part in each other's training. When Tanjirou apologizes for interrupting, he says it's no problem and that Sanemi was mad the entire time and he couldn't get a good talk with him, but he's glad that he found out what he likes. He reveals his plan to sneak some ohagi in a bag and give it to him. Giyuu smiles when he says that they can get along for sure if he does this. This is very interesting, considering this means Giyuu wants to get along with him and it would make him happy. Giyuu also hadn't smiled before this panel, so that means the idea of getting along with Sanemi is enough to put a smile on Giyuu's face (something extremely rare). When fighting against Muzan, Giyuu's sword slips out of his hand and he gets saved by Obanai and Gyomei. Sanemi throws a sword at him and tells him not to space out or else he'll kill him himself. After the other pillars make their blade shine red, Giyuu and Sanemi make their shine red by clashes their swords together, they're the only pillars who helped each other make it shine red. During the fight, all the pillars work extremely well together, not once getting in each other's way. This includes Sanemi and Giyuu, who arguably have the worst relationship within the pillars. When Muzan is at the door of death, Gyomei yells to attack and chip away at his stamina, but Sanemi has a hard time moving and Giyuu suddenly comes in and attacks.

After the final battle, the only 2 pillars to survive are Sanemi and Giyuu and they attend the final pillar meeting together. When the children of the previous master bow and thank them, they protest. When the children end up crying, they look at each other and smile, this is another one of the few instances Giyuu has smiled and yet again it has something to do with Sanemi. Sanemi is also someone who rarely smiles outside of battles or anger, although it happened more than with Giyuu. In the extra pages for the final volume, there is a picture of Sanemi and Giyuu eating together after the final battle and just the 2 of them.

Giyuu and Sanemi were possibly the pillars that got along the least at the beginning, but after the final fight, they are shown to get along well, just like Giyuu had hoped. During the show, while Sanemi hated Giyuu, Giyuu seemed to have no ill will against Sanemi. Giyuu did occasionally somewhat vaguely tease/insult Sanemi, but he never seemed annoyed by Sanemi's rude nature, for example in one of the extra pages of volume 19, while the other pillars were scolding Sanemi for his rude behavior, Giyuu was seen in the background with his usual poker face. It was also seen that Giyuu actually wanted to get along with Sanemi, although that was one-sided at first, after the battle Sanemi let go of his grudge and they were shown to get along well.

Fanon
Fans like to call the pairing "Hotheaded idiot X Oblivious idiot", since despite their exterior, both characters have proved that they do have a softer side that has simply been buried due to too many losses. Fanworks often explore the trauma the two have gone through and them finding comfort in each other. As such, future canon-divergence universe have become popular, especially ones that take place after Muzan's defeat.

Sanemi is also canonically colorblind, whether this was just a metaphor or literal has not been confirmed. But due to the many different forms of colorblindness, with the most common being red-green colorblindness, blue may be the only color Sanemi can see properly. Blue also happens to the color of Giyuu's eyes and the main color for his breath technique/sword.

Some have noted the similarities between this ship and TodoBaku. Since both ships involve a hot-head and cool, collected character being shipped together and they both went from people who get along badly, to friends and the cool, collected one wanted to eventually get along with the hot-head.

On AO3, it is the fourth most written ship under the Demon Slayer tag. It is also Sanemi's most written and Giyuu's second most written.

Fandom
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Trivia

 * Sanemi's favorite food is ohagi, which Giyuu wanted to make for him; Giyuu's favorite food is simmered salmon with daikon.
 * They are the only pillars who survive the battle against Muzan and attend the last pillar meeting.
 * In the main series, Giyuu has been shown to smile 3 times, 2 of them had to do with Sanemi. (Once after thinking about how they can get along, once at Sanemi during the final pillar meeting and once when seeing Tanjirou and Nezuko with Urokodaki in the Butterfly Estate)