Rin Hashima's History
She is first shown in the epilogue of Turn 28, after Team TRY3 defeated Team Wanderer, alongside Sugiru and Shouma, taking notice that one of them was Chrono Shindou, before their coach, Ibuki approached them.
After Sugiru's loss, when she looks at her opponent's identity, she smiles in excitement, recognizing Tokoha as Mamoru's little sister. Knowing that she is her opponent, she decided to step on the bread that Kumi bought as a prayer for victory. When Tokoha chases her to the toilet to order her to beg for forgiveness, she splashed water instead to Tokoha, muttered "cockroach" as an excuse, while Tokoha, confused, searched for said cockroach.
It is shown later that she met Mamoru Anjou once when she was still a child, and although she is stronger than her peers, she is no match for Mamoru. She is upset that Mamoru did not remember this encounter, however.
When fighting Tokoha, she keeps calling Tokoha "Mamoru's little sister", which enraged her (on top of her demeanor earlier), and shows their difference in power with giving her handicap by not finishing her while she had the chance to do so. Despite that, she still wins against Tokoha without much effort.
When Shouma fights Shion Kiba, she watches the game for a while before falling asleep. They later compete in the national tournament with Sugiru.
At a tournament held at the United Sanctuary Branch, Tokoha confronts her, declaring she'll win the right to fight Team Demise and defeat Rin before storming off, to which she only responds with annoyance. She then observes the tournament, along with Shouma and Ibuki, until she sees Tokoha's match and leaves.
While infiltrating United Sanctuary Branch, Tokoha saw Rin and pursued her afterwards. Knowing that she was being followed, she waited for the girl in a corner. She pointed out that what happened inside the United Sanctuary Branch is none of Tokoha's problems. When Tokoha said that winning is not everything in a cardfight, it sparks her memory of when she lost to Mamoru, and thus declares that Tokoha is her enemy.
Shouma then informs Rin that Kanzaki is fighting Team TRY3, and offers to show Tokoha's match, but she declines.
During the day of the special match, Rin fights Tokoha again, and she still teases her about her brother, but Tokoha felt calm, which angered Rin. She became more annoyed with Tokoha when she reminded her that Mamoru might have made her mad back when she lost to him. Tokoha then Strides Dream-spinning Ranunculus, Ahsha, finishing Rin off. Rin quits Team Demise straight after the fight, and angrily walks off.
She later comes to the Dragon Empire Branch where she reveals her intent to defeat Tokoha to Mamoru. However, the Branch Manager believes she was there for something else, to which Rin responds by stomping her heel on his foot.
