IbaRin

"You and I... I'll get both of us out of this rotten family business."

- Rin to Ibara, Chapter 57

IbaRin is the slash ship between Ibara Obami and Rin Obami from the Kakegurui fandom.

Canon
Ibara and Rin were both introduced in the same panel, set out as both the representatives of the Obami family. Ibara goes on to compete in a game called "The Greater Good Game" against Yumeko, Itsuki, Kaede, and MIro, while Rin enters (but does not finish) a competition against Kirari. Other than that, there weren't any scenes of them together until Chapter 57.

A deciding factor in the gambling election was introduced; scumcoins. Ibara is shown handing out scumcoins to students around school and using his charm to convince people to hold on their scumcoins for longer. He meets back up with Rin, and Ibara follows him to a secluded area. Rin asks for an update about the scumcoins, and Ibara complies, complimenting on how popular they're making him. Rin replies with a smile that he doesn't really care about his reputation, but that any decent swindler needed a backup plan.

He turns to Ibara, noting in his work at the academy, and promising that he'll tell the folks back home about him. Ibara begins reminiscing about his thanks to Rin. He states that although he couldn't lie at all, Rin helped him stay in the Obami family, who were known as liars. The ravenette agrees, calling him an 'honest man'. Ibara proudly says that with the scumcoin business, he wasn't lying to anybody, to which Rin continues; he's only told Ibara about that which he can speak truthfully about. Ibara internally celebrates his role in helping Rin this way although being a dropout.

Rin finally adds that Ibara has no need to see how the election turns out, subtly dismissing him right afterwards. Ibara has a slightly shocked expression at this, but he says he understands and reminds himself that he couldn't as Rin any questions about the truth because he couldn't face those anxieties. Rin finally adds that Ibara has no need to see how the election turns out, subtly dismissing him right afterward. Ibara has a slightly shocked expression at this, but he says he understands and reminds himself that he couldn't ask Rin any questions about the truth.

Later, Ibara receives texts from Nozomi, saying that Ririka wants to gamble with Rin. When Rin is actually approached by Ririka, he tears up based on her value of him. Ibara is quick to act, trying to convince Rin to leave the game. Ririka elaborates on her worth, and Rin immediately loses his dejection and cheers up.

During turn 3, Rin uses two points to explain why he couldn't be cheating. One of the reasons was the fact that Ibara was playing, and even Ririka saw that. Ibara was able to truthfully tell her that Rin didn't send him any requests. Yet he later realized this was because Rin had sent a request to only the three other girls, not him.

He tentatively asks Rin if he really should've attacked, before being silenced by a glare. Even with this though, Ibara doesn't seem to mind being looked down by Rin, he just couldn't accept the fact that Rin may have been "a weak person deep down, capable of keeping it together only by looking down on others."

With the last round of the game, Rin ends up in last place. With his failure, he covers his face as if about to cry, sadly saying he should just give up aiming for the Momobami's post. Ibara anxiously runs to his friend, only to be confronted with the fact that Rin had lied to all of them. Ibara angrily holds up Rin's collar, even as the latter smirks. Rin admits that his promises and words were all worthless, and grimly says that a liar would also be doomed to live as a loner. He expells Ibara from the Obami family as tears form in the taller man's eyes. Ririka calmly asks why Ibara, an honest man would defy his natural will to tell a lie, and why Rin, a swindler, would keep on telling lies for Ibara. She answers herself, saying that it was because each of them cared for the other, no matter what they said. Rin sees his loss in his opponents' eyes and internally begs for them to stop staring at him like that. They all start laughing at him, calling him a liar and telling him to die. Rin's finally forced down in a corner, staring at nothing, his will broken. Mary turns back and suddenly sees Ibara holding Rin's shoulders, protecting him.

Quotes
"...Because deep down, I know he's probably lying for my sake."

- Ibara, Chapter 57

"I'm willing to fight! Fight and do what it takes to help Rin-san! That's what I've been put on this earth for!"

- Ibara, Chapter 59

"If I'm in this, I gotta fight for Rin-san!"

- Ibara, Chapter 59

"That you two... Are worried about each other."

- Ririka about Rin and Ibara, Chapter 62

Fanon
Ibara was transported to a (likely metaphorical) scene in which he is a young child with black hair. He's doubled over in front of his superiors, throwing up because of his inability to lie, as an Obami who can't tell a lie is likened to a heron without a break. The only person willing to help a 'cursed child' like Ibara was a young Rin, standing out from the light and holding a hand out to the sick child. Rin extends the offer to outdo the Momobami family name, and in turn will never make Ibara lie to anyone.

Personality-wise, Ibara is an honest and energetic individual, while Rin is a conniving liar, making them total opposites. Despite this, Rin was the only one to lend a hand to Ibara in the Obami family of swindlers, leading Ibara to trust and follow him loyally.

There is a bit of controversy surrounding the ship because they share the last name of Obami, but people typically assume that they're distant relatives or Rin "welcomed" Ibara into the Obami family, making them not biological relatives.

Slash ships are rare in the Kakegurui fandom, as the main cast is mostly made of females and there aren't many male relationships in the series. Nevertheless, the way that Ibara looked up to Rin did not go unnoticed by fans, and ended up having quite a large following in terms of shipping. It's the most popular slash ship in the fandom, unrivaled by any others.

Fandom
FAN FICTION

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Moments

 * While Rin walks down the hall amid gossip about his future position as the Council President, he looks pleasantly surprised to see Ibara waving to him from the hallway.
 * Ibara internally celebrates his role in helping Rin this way although being a dropout.
 * Ibara waits anxiously for Rin to reply to Ririka's challenge
 * The moment Rin starts becoming tearful, Ibara immediately tries to guide him out of the situation
 * Ibara looks extremely confused when Rin pops out of his sullen demeanor when presented with a worthy gamble
 * After Rin verbally slanders Nozomi for going to Ririka and Mary's side, Ibara internally apologizes to her for Rin's actions, justifying them.
 * He explains that Rin needed total control over the family, with an absolute hierarchy, asserting his confidence to fight for Rin.
 * Ririka claims that Rin's plan only allowed for Ibara and himself to win. Clearly, the honest man didn't know this.
 * Ibara notices Rin's still-calm demeanor even after his trick was revealed and wonders if the election meant nothing to him.

Trivia

 * The Obami family are known as a family of swindlers.
 * Ibara is apparently physically unable to lie.
 * Rin and Ibara used to share the same hair color (black).
 * His original hair color was black, but was dyed to orange in his later years.
 * The end scores for 'War' are as follows:
 * Rin with -269
 * Ibara with 91