Sakuraba Fuyu is the cutest sister in the world. Although she is a junior high school girl, she is a beautiful girl who looks like a model, her breasts grow perfectly, and she has a good personality. “Let’s play a game! Today I’m going to mess with my big brother!” “Fufufu, how about you? I choose the clothes that my big brother seems to like.” “Big Brother, let’s take a bath together? Sometimes it’s good ♪” However, She’s still a kid at home. For me, She’s a cute little sister forever, and I just enjoy the skinship of a brother and sister. I thought so……. However, one day, the fact of the shock was revealed that we were not real brother and sister! My sister couldn’t be my girlfriend … but this is a different story !? No matter what, in the end, a romantic comedy that is “absolutely” tied to my little sister!