Cô gái hentai của tôi

One fine day Yonezu happens to find his cute girlfriend Hina in a remote park, where she is going after her sexual preferences. Hina actually is a good girl who enjoys going to an elite college. At the park, Yonezu watches Hina for a while until he is no longer able to. He then walks over and questions her doings. What Yonezu however then learns appears only to be the tip of the iceberg.