ONE N' ONLY, a group featuring "Jatin Pop," brings an EP. The title track "Fiesta" is a samba/carnival-style song with a dynamic rhythm. The limited edition and regular editions have one different song. The limited edition comes with a Blu-ray, featuring the live performance of "ONE N' SWAG -All out-" held at Pacifico Yokohama Grand Hall on April 27, 2024. Consists of two discs. Comes housed in a slipcase with a digipak packaging with a 60-page booklet.