In 2006, Hirokawa established a design firm "SOMA DESIGN", which is involved in fashion design, graphic design, sound creation, and visual direction and design. At the same time, she launched the design project "SOMARTA" and released a body wear series called [Skin], whose concept is ‘the possibilities of apparel for a body'. Since 2007 S/S Collection, she has been participating in Japan Fashion Week. She was awarded the Newcomer's Prize of the 25th Maichichi Fashion Grand Prix and the Shiseido Sponsorship Award. She collaborated with several corporations and introduced her installation work, furniture, and concept car at both domestic and international exhibitions: "NEOREAL" Exhibition at Milano Salone (Canon, 2008), "iQ × SOMARTA MICROCOSMOS" Exhibition (TOYOTA, 2008), "Feel and Think: A New Era of Tokyo Fashion" Exhibition (Tokyo Opera City Art Gallery, 2011),"Future Beauty" Exhibition (MOT Mercedes-Benz, 2012), "Leonardo da Vinci: L'idea della Bellezza" Exhibition (Bunkamura, 2012), "Out of Head" Exhibition (MAD NY, 2013) etc. She has been involved in a wide range of activities including uniform design for Shiseido's Total Beauty Facility SHISEIDO THE GINZA in 2011.