Original Title: じみへんっ!!～地味子を変えちゃう純異性交遊～じみへんっ!!～地味子を変えちゃう純異性交遊～
English Title: Jimihen!! Jimiko o Kae Chau Jun Isei Kouyuu
The story follows Rena Yukuhasahi, a reserved office lady and Ryouhei Hachiya, a businessman and fellow colleague. Yukuhasahi appears to be the most reserved girl in the company, but becomes a super beautiful woman when she dresses up.