Sex & Friend: Osananajimi no Amai Nioi

This Japanese hentai visual novel puts the player in control of Masaki, a student who attends the same school as his beautiful childhood friend Mitsuru Ebina. While a popular rumor at school is that the two of them are dating, in reality, they are always at each other's throats and show each other nothing but hostility. Despite this, however, they both are attracted to each other, and it takes Mitsuru to be the one to confess. Masaki reciprocates her confession with a kiss, and now that he can call her his girlfriend, he immediately starts to use her to relieve all of his pent-up sexual frustration, both inside and outside of school. Mitsuru is voiced by Nazuna Gogyou.