主人公が泳ぎに行くといつも監視員をしている、顔見知りのお姉さん。ボーイッシュな感じで、競泳水着がよく似合う。 なりゆきにまかせて強引に、自分がコーチを任せたはずの主人公が、いつのまにか市内でも噂になっているのを聞き「あの男の子が？どんなもんなのかしら」と試そうとしたのが、自身の潮吹き体験の始まりとなってしまうことに……!? 「わかった！ ここの無料チケット10枚つけるから！ ね…助けると思って…」
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