Tsubasa Shibahime is a petite, beautiful girl, who has loved Soichiro since they attended middle school together. Although she studied hard so she could attend Hokuei High School with Soichiro, a bad skateboarding accident prevents her from starting school with everyone else. In the past, Tsubasa tried to confess her love to Soichiro several times, but Soichiro was comically oblivious. So she settled for being treated as Soichiro's younger sister as long as his affections were not occupied by another girl. But upon learning that Soichiro has a girlfriend, she becomes insanely jealous and increasingly resentful of Yukino. After fighting it out with Yukino, they become good friends. Among their group of friends, she is the baby of the group and Yukino cannot resist her cuteness, often wanting to dress her up like a doll. Tsubasa's mother died while she was giving birth to her, so she was raised by her indulgent father, and it was her loneliness that she had in common with Soichiro. In an episode Tsubasa is very possessive of her father and throws a fit when she learns that her father plans to remarry a woman named Izumi, her nurse at the hospital where she was treated for her skateboarding accident. She feels especially abandoned and hurt because she feels that she has just lost Soichiro to Yukino. Tsubasa changes her mind about the marriage after she meets Kazuma, her step brother-to-be, and realizes that Kazuma understands the longing for a family, as he is also the only child of a single parent, and knows the pain of coming home to an empty home every day. Later on in the manga, Kazuma would fall in love with Tsubasa and they end up getting married. In the anime television series, Tsubasa Shibahime is voiced by Mayumi Shintani in Japanese and Lisa Ortiz in English.