Saiko Tagaya (多賀谷 彩子 Tagaya Saiko) is Chiaki's former girlfriend and is a major in opera singing.
She has a long hair and big bright eyes. Is usually seen wearing a pair of earrings and necklace.
Despite breaking up with Chiaki, Saiko has been in love with him all along. She broke up with him because she thought he would never pick himself up from his loser status and especially when it came down to music, he was equally critical of everyone including her, and yet even though he was far more talented than everyone (and herself), he was the most critical of himself, and that made it hard being with him. After breaking up with Chiaki she goes through a few relationships, but because of her lingering attachment to Chiaki, she was never able to fully put him behind her.
Later on, she comes to terms with the fact that Chiaki has moved on without her, and presumably moves on as well. Saiko sometimes exhibits a spiteful streak in her, especially to those whom she views as rivals, but is also capable of gentleness. Once, when a drunken Nodame bumped into Saiko at a karaoke restroom, Saiko first smacks her away, then after realizing Nodame was drunk, gave Nodame her shawl before leaving.
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