Gogakuyuu (ごがくゆう), the full official title being Otona no Mugicha×Gekiharo "Gogakuyuu" (大人の麦茶×ゲキハロ「ごがくゆう」; Adult Barley Tea × Gekiharo "Gogakuyuu"), is a stage play including Morning Musume members Fukumura Mizuki, Sayashi Riho, Iikubo Haruna, Ishida Ayumi and Kudo Haruka. It is a special collaborative work between Gekiharo and the acting troupe Adult Barley Tea and the fourteenth Gekiharo theater work overall. The play was written and directed by Shioda Taizo and it was produced by Andrew Tamon Niwa and Sasaki Junko.