Hadaka no sanshimai: Inkō (裸の三姉妹 淫交 Hadaka no sanshimai: Inkō) is a Pink film directed by Yasufumi Tanaka and starring Mayu Asada, Sakurako Kaoru and Komari Awashima. It was named tenth best Pink film of the year at the Pink Taishō ceremony and Tanaka was named Best New Director for this, his directorial debut. The film also won the Pearl Prize at the Kansai Region Pinky Ribbon Awards ceremony. Tanaka filmed Hadaka no sanshimai: Inkō for Haikyū, and Shintōhō released it theatrically in Japan on March 31, 2006. It will be given a theatrical re-release on October 22, 2010 under the title Tonari no sanshimai: Yarikurabe (隣の三姉妹 やりくらべ Tonari no sanshimai: Yarikurabe).