Kōichi Aragaki (新垣浩, Aragaki Kōichi) and his partner Tomoya Shiranui are doubles partners, who, having grown up playing under an extremely hot sun, have extremely high endurance, which makes up for not being able to use the "Shukuchihō" technique.

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With the greatest lung capacity and endurance on the team (in the Anime, but in the Manga it's Shiranui), Aragaki holds out the longest during Higa's underwater stamina exercises. Nevertheless, he was completely worn out after his doubles match against Seigaku.