A teacher is bewitched by the singing voice of a mermaid during an inter-species school tour. As they spend days together on the bus, they engage in non-stop sexual activities with three active mermaid idols - tanned Ella, fluffy Elsie, and slender Elio. The harem experience becomes too tempting for the teacher to resist as he becomes increasingly attracted to these monster girls. With each passing day, they explore new intimate acts, leading to steamy encounters filled with oral sex, creampies, and more. As the tour comes to an end, will the teacher be able to resist their siren call or will he succumb to his desires and stay with them forever?

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