Rin is a young child that first appears after InuYasha used the Wind Scar on Sesshomaru. The Tenseiga saves Sesshomaru by transporting him to a forest glade near Rin's village, though Sesshomaru is still injured by the attack. While in the forest, Rin finds Sesshomaru in a feral state. Rather than be frightened, Rin persistently tries to help Sesshomaru by bringing him fish from her village's preserve, despite his insistence that she mind her own business. The village men beat her for stealing the fish, and when Sesshomaru asks about the injuries when she returns, she simply smiles instead of responding - though he retracts the question at this.

Rin is later killed following a conflict between the wolf demon Koga and a thief. After the thief is killed, Koga lets his wolves attack the village for food. Rin attempts to make her way to Sesshomaru, but trips along the forest path as the wolves catch up and attack her. After recovering, Sesshomaru catches her scent and finds her mauled and lifeless body. Remembering Rin's smile and stating aloud that he wishes to test his sword again, Sesshomaru uses Tenseiga to resurrect Rin. After setting Rin on her feet again, Sesshomaru walks away, leaving the dumbfounded Jaken and a wide-eyed Rin standing on the path. Still mute, Rin follows Sesshomaru. By their next appearance, Rin has a new, more colorful kimono and is devoted to Sesshomaru and Jaken. She now talks and acts more like a typical child.

In the final chapter of the manga, set three years after most events of the series take place, it is revealed that Rin has stopped traveling with Sesshomaru and Jaken. She now stays in the village with Kaede and Sesshomaru is shown visiting and again bringing a gift for Rin.

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