Soganuma Yui

A girl who used to live in an internet cafe and who is proficient in all kinds of housework. She is quite shy but her personality changes when she's on her laptop. She pays her cost of living with the money she makes through internet affiliate business, and feels unease in an environment without internet.
She is not ashamed of being naked in front of the protagonist and wants to take baths with him. Despite not going to the school, she studies at the dorm and also happens to be smarter than the protagonist.