Nana is a serious and good student. When she was studying in her room, her brother came in and gave her a massage, but his touch became more and more erotic and he started to massage her breasts.... She has no experience with men. What's more, Nana is weak to pressure and ends up having sex with her brother! She may be good at studying, but she's terrible at sex. She was excited, but her brother ended up teaching her all the things that feel good!