ゆる行きAQUARIUM (Yuru Iki AQUARIUM)

Yuru Iki Aquarium is a song sung by Kaito Fuga, Rin Kagamine, Len Kagamine, and LEON. It is the one-hundred-and-fifty-fourth track in Other Vocaloid Songs 7: Mostly Kaito, the forty-seventh track in Other Vocaloid Songs 11: Mostly Rin, and the two-hundred-and-fifty-first track in Other Vocaloid Songs 25: Mostly Len.