While Beat acts aggressive and impulsive, Rhyme balances him out with her calm demeanor. She is always wearing a smile and is kind to everyone she meets. Always optimistic and reasonable, Rhyme manages to keep everyone organized when she's around. Her young and pure heart is impossible to hate, and gives her great love and loyalty. She has no dreams, except to help Beat. She has an addiction to adages and no shortage of smiles, and without her, the others would be lost.
It is later revealed that Rhyme is Beat's younger sister, Raimu Bitou (尾藤 来夢).
When her brother Beat ran away from home, Rhyme soon followed. However, both siblings died when Beat tried to save her from being hit by a car and had to play the Game. Beat and Rhyme met up with Neku and Shiki on the second day of the 1st week. Though they planned to team up, Neku's asocial tendencies combined with Beat's competitive spirit kept both teams separated. Nevertheless, both sets of Players developed a close bond and agreed to assist each other. Later, on the third day, Rhyme and her brother completed the mission by killing a small Noise that Neku and Shiki had missed due to being distracted by their conquest over another, stronger Noise. On the fourth day, though, the mission became far simpler- a simple movement to another area with no time limit. Unfortunately, the Reapers used the lowered guard of the players to lay a trap; Beat, while fooling around, was almost erased by a powerful, hidden shark Noise. Rhyme, in the ultimate act of love, pushed her brother out of the way and was erased in his stead, leaving only her favorite pendant.
Her memories and love of Beat were stated to be Beat's Entry Fee, though Beat first assumed it was Rhyme's instead (which comes as a shock to him). She does recall that she had a brother and worries about him, but cannot connect this to her partner, whom she believes to be a kind stranger. This fact tore Beat apart inside and so he resolved himself to win the game and restore Rhyme's memories.
She lived at the end of the Game and was seen with Beat, Neku, and Shiki. However, Mr. H's reports stated that since she technically lost the game, her entry fee was non-refundable, and so all of her previous dreams and ambitions were likely erased forever. Because Beat won, however, her memories and love for him were returned.
