Rin is a young girl in third grade who has an intense crush on her teacher Daisuke. She has a mischievous nature and has proclaimed herself to be Daisuke's girlfriend; she will go to great lengths to make him fall in love with her. This has resulted in her crossing moral and legal boundaries many times, including blackmail and taking advantage of Daisuke's inability to respond to her forcible advances by threatening to scream that he is trying to molest her, when in fact it is her that is making those advances. Despite Rin's mischievous nature she has shown herself to care deeply for her friends and family, going to any length to defend them. Also much of her bad behavior is a result of trying to hide the traces of the vulnerable little girl she used to be as a result of a tragedy in her past.