Koyuki's guitar and swimming teacher, Saitou once swam in the Olympics but was unable to achieve his dream of winning, so has turned his life to teaching others how to swim better. Saitou is loud and demanding in public, and especially strict when it comes to swimming. But when he is out of the water he is much more open, even turning to Koyuki for advice on his attractions to Momoko. Saitou is a fan of British rock and his favorite band in the anime is the fictional Rocket Boys (the manga version has him liking The Beatles). Saitou's guitars include a Gretsch White Falcon, and a Gibson Les Paul Standard copy by "Tibson" (a Gibson imitation brand). Before he met Momoko, he kept nearly a library of pornographic and young female modeling magazines (which he once explained to serve as documented proof that he lived through the Showa and Heisei eras) Saitou is also shown to be muscular in his swimming attire.
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