JimiHen

The usually quiet girl is moving her hips on her own… Asking me to go deeper… Letting me do whatever I want… This side of her only I know… I want to see more of it.

(Source: Coolmic)

Volume 1: Jimihen!!: Jimiko wo Kaechau Jun Isei Kouyuu (じみへんっ！！～地味子を変えちゃう純異性交遊～)
Volume 2: Jimihen!!: Jimiko ga Torokeru Dekiai Seikou (じみへんっ！！～地味子がトロける溺愛性交～)
Volume 3: Jimihen!!: Jimiko mo Midareru Zecchou Seikou (じみへんっ！！～地味子も乱れる絶頂性交～)
Volume 4: Jimihen!!: Jimiko ni Himitsu no Haitoku Onsen (じみへんっ！！～地味子に秘密の背徳温泉～)

Notes:
– Includes 4 extra chapters.
– Originally serialized as a web manga under the title Jimiko wa Igai ni Erokatta (地味子は意外にエロかった).
– Released in long-strip format and subsequently sold in traditional format.