Io Tamai

Io is Shinichi's half-sister born from Shinichi's father and his mistress. Her mother enjoys trifling with the Takaura family's assets, which makes Io disdain her. Since her familial life is rather complicated, she has gone through different interests from reading books, to researching black magic, and even ran a website dedicated to aesthetics. She is extremely disgusted by anything pertaining to love or attraction. She has a pet Shiba Inu named Potato. (Source: Wikipedia)