The second exclusive work of her sister'Rio Kuriyama', who has an outstanding cute style, is a four-production work that thoroughly delves into both sides of her "S" and "M" who challenged not only sexual development but also sluts. Rio, who is very curious about H, has a lot of play to do! Challenge 6 first experiences such as portio development, male tide, and subjectivity! 220 minutes to feel the infinite erotic potential! Of course, you can enjoy Rio-chan's cuteness and cuteness, and the style of the 148cm slender E-cup!