Hatsune Arisaka

Kazuki's older sister, who is constantly trying to get Kazuki and Yūji together and inadvertently (and intentionally) puts them both into embarrassing and lascivious situations. There are some indications that she considers the mishaps (and the arguments following them) funny. Hatsune is good at everything she does, from cooking to sports. She is also considered extremely beautiful, sporting a very curvaceous figure and well-endowed breasts. She likes to tease her sister by showing her how infatuated Yuuji is with her breasts. Hatsune frequently engages in cosplay around the house and can, from time to time, be quite frightening to the people around her. Unlike her younger sister and Marie, Hatsune is perfectly unafraid of insects - or anything else. Although it's implied that Hatsune's true weakness is worrying about her sister's health. When Kazuki fell ill with a cold, Hatsune became comically uncoordinated and unskillful every time she heard Kazuki sneeze. She delights in making her sister think that her affections may be more than sisterly, and in aiding Yuuji, even when he goes too far.