Kei-chan (23), an active girl in shorts, has a hobby of riding motorcycles and has even obtained a large vehicle license. But she's not the only one who rides motorcycles... She's also great at riding men! When she gets picked up, she immediately has sex, and even when she's on a touring trip, she hits it off with a middle-aged rider and has sex. She loves sex so much that she finally applied to be in an adult video. The serious sex of a girl who is both active in her hobbies and sex... to put it bluntly, she's 'filthy horny'!