Despite its almost two decades of existence, Sexfriend still holds as one of my favorite hentai if not outright my favorite. Animation wise it shows its age, but it's still better than half of the hentai that gets released these days as it's uncensored, has pubic hair and an easy to follow story. Also, Ami Shizuki voices Hayase Mina, that alone should be a reason to watch it. On a side note, it has a game and a small novel that explores the characters stories more deeply, like surprisingly deep, it's however in Japanese and you can find it in certain Nyaa site and Amazon JPrespectively.