This is a song by Obata Youko from the series Mahou no Star Magical Emi. The song is “Nankoku Ningyo Hime“ meaning “Tropical Mermaid“ as she repeats in the chorus with a strong japanese accent. The images are from the show. I threw in a few images of Youko herself singing the song.
Partial translation of the lyrics :
We gaze at each other,
pretending not to,
in the swimming pool.
Our sunglasses hide our eyes.
Our hearts pound wildly
A splash and I start to talk
“I’m sorry“
Would you like to go to the beach?
Tropical Mermaid
Hold me on the beach
while the tide is up
please
If I’m alone,
I’ll vanish with the setting sun
Tropical Mermaid