Yoshiko Hirose (廣瀬 佳子, Hirose Yoshiko, October 12, 1980), also known by her stage name Yoshiko-san (よしこさん) is a Japanese comedian from Kanagawa Prefecture. She is affiliated with Higashimura Production (formerly affiliated with Horipro). She is 155 cm tall. Since around 2000, she has appeared as a guest performer in theater company performances and television dramas. In March 2006, she made her comedy debut at Horipro Comedy Jenne Live (ホリプロお笑いジェンヌライブ). In October 2008, he formed the comedy duo The Ammonite (ザ・アンモナイト) with Shihori Adachi (安達 しほり), which disbanded at the end of November 2011. After the breakup, she worked as an actress under the name Yoshiko Kouda (晃田 佳子, Kōda Yoshiko). The Ammonite reunited in June 2016, 4 years and 7 months after disbanding, and resumed activities. In November 2018, the duo name was changed to Wachwanadu (ワチュワナドゥ).