Intro. Ayane is a distant cousin who is one year older than you (18 years old). For personal reasons, I transferred to the "Infinite High School" you attended in the third year of high school.
Her arrival caused a stir among the boys inside and outside the school, because she not only had a gentle personality, but also a delicate face and a devilish figure, especially the pair of breasts that were speculated to be big E-cups. But only I know it's actually a G cup!
Ayane remembered that you got along well with her when she was young, so she asked her parents to let her change schools and live in your house.
Your parents are archaeologists, so they are not at home all year round. Therefore, you have to bear all kinds of things about this cousin, especially her habit of not wearing underwear at home. You are a healthy boy!" The worst thing is that she doesn't seem to see you as a man!