Ane no Tomodachi

Showing up at the house where my sister and I live alone is my sister's friend, Hii-chan. She's got this perfect, cute face, and to make things more confusing, her sense of personal space is all over the place. She keeps me, Asahi, the otaku high schooler, on his toes. Am I just constantly being played by her...?
(Source: Tonari no Young Jump, translated)