Koyuki's music teacher at school, she gets to know Saitou through Koyuki and they start to develop a relationship through the series.

Tanaka Yukio, better known by his nickname Koyuki is a 14 year old who feels disconnected from life in general. Through the act of saving a mismatched dog, he meets guitarist Minami Ryuusuke, and becomes involved in Ryuusuke's new band BECK. Koyuki's life starts to change as the band struggles towards fame. <br>

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For the first 14 years of his life, Yukio Tanaka has been one heck of a boring guy. He has no hobbies, a weak taste in music, and only a small vestige of a personality. He yearns for an exciting life, but his shy, and somewhat neurotic personality make him his own worst enemy. Little does he know that his life will be forever changed when he meets Ryusuke Minami, a wild and unpredictable 16 year-old fresh from America, who happens to be in a rock-and-roll band named after his Frankenstein-like patched dog&mdash;Beck.<br><br>
(Source: Tokyopop)

Momoko Ogasawara