Kotomi Tsuda

Kotomi Tsuda is the younger sister of Takatoshi Tsuda, who she affectionately calls "Taka-nii". Like her brother, she ultimately ends up attending Ousai Private Academy because of its proximity to home. She is considerate and caring toward others, but is curious and extremely (Takatoshi would say embarrassingly) enthusiastic about adult matters. She is easily one of the most nonsensical characters in the series, and rivals Shino Amakusa, Aria Shichijō, and possibly even Naruko Yokoshima as one of the most perverted. Kotomi is a cute girl with long dark brown hair normally worn in twintails. She has big brown eyes and often has a big smile or grin on her face. She is more stylish than her brother, often wearing different outfits on her days off. On a few occasions it has been observed that her breasts have grown quite a bit since entering high school, as she complained that her first uniform felt tight around her chest. Kotomi is a bright and cheerful girl who makes friends easily. She is very popular among her classmates and has many friends, even among seniors like Mutsumi Mitsuba. She is naturally charming, to the point Suzu thought she could be an idol. However, Kotomi is also rather lazy and unmotivated, resulting in her being rather book-dumb and needing a lot of coaching from Takatoshi or Suzu to even keep up with Ousai's standards. In addition, she has a vivid imagination and often acts childishly, such as pretending she is the main character in a shounen anime. Worse still is her shameless interest in adult matters, especially the kinkier forms of sex. Like Shino or Aria, she is well versed in common tropes found in galge (the term for dating simulation games like Love Plus or Amagami) as well as pornography. She doesn't seem to have any sense of time or place, happily talking about sexual-related matters anywhere and with anyone, much to the chagrin of Takatoshi or her best friend Toki. There have been jokes surrounding Kotomi and Takatoshi about incest. Her interest in perverted matters, her airheaded & easygoing nature, and her tendency for jokes and not taking things seriously all culminate in making it difficult to tell whether Kotomi is straight-up joking about feelings for Tsuda or if there really is something there that she doesn't tell anyone. There have been no strong indicators to show Kotomi having real incestuous feelings for her brother.