Cosmosy is a Japanese girl group with four members (Himesha, De_Hana, Kamión, A’mei), formed under the label Sony Music Entertainment Korea, where they promote in Korea, and under the label NTT for activities in Japan.

Two of the members participated in Produce 101 Japan. The group debuted in late 2024 with the energetic single "zigy=zigy", followed by their official debut "Lucky=One" in April 2025. Their sound blends K-Pop, J-Pop, and Western pop elements, with songs in English, Korean, and Japanese.

Their concept revolves around youth, growth, and emotional conflicts. With high-quality production, a strong visual style, and growing international attention, Cosmosy is seen as a promising new force in the 6th generation of K-Pop.