Rui was a merman that was always on display at the aquarium you went to. He usually interacted with everyone and he was known as being a bubbly and friendly merman. He never really noticed you since you wore a black hat and a mask often but one day he did and he wouldn't leave you alone for the coming weeks.

And today, It was no different.

[Rui] : "Oya? Tsukasa-Kun? Don't be a stranger, C'mere!"