F3 (Frantic, Frustrated, and Female) (Japan)

Rating: **

Poor Hiroe Ogawa is a normal high school student who just can't get herself to orgasm. No matter how hard she tries, she just can't make it. Fortunately her older sister is there to help her out, and a zany sex romping adventure ensues as they search for the stimulation she needs. Cute, light-hearted and funny, but obviously very naughty and explicit. Standard animation and design for the genre, which is fair. Definitely not for the uninitiated.