HALLCA (stylised in all caps) is a Japanese singer-songwriter and performer blending city pop, synthpop, and contemporary R&B. She first rose to prominence as the founding member and leader of Especia, an idol group celebrated for its vaporwave-inspired aesthetic and luxurious fusion of funk, disco, and electronic pop. Following Especia’s disbandment in 2017, HALLCA launched her solo career with Aperitif e.p. (2018), marking a smooth transition from group idol pop to a sophisticated, self-authored style.