Yaya Kohaku (琥珀 やや, Kohaku Yaya, born March 7, 2002) is a Japanese AV actress affiliated with ACT. Her body measurements are 82-63-89 cm (A cup), and her height is 1.65 m (S type). Her hobbies include singing and idol fandom. On August 16, 2022, she made her AV debut as an exclusive actress under the label Tennen Shōjo Muku, using the stage name Hikage Hinata (日向 ひかげ, Hinata Hikage, born March 7, 2000). At the time, she was affiliated with LiStarPRO (formerly Granz Pro), and her body measurements were 80-61-89 cm (A cup), with a height of 1.62 m (S type). In late August 2024, after leaving LiStar, she changed her name to Yaya Kohaku (琥珀 やや) and became represented by the agency ACT