Taiga is a girl in Ryūji's class, as well as the series' main female protagonist. She has a well-regulated and beautiful appearance though is unable to stomach company from others. Due to her often snapping at others in brutal ways and her short stature, she is given the nickname "Palmtop Tiger". Her under-developed body and the added nickname has given her a complex which in turn serves to give her a negative attitude and facial expression. Essentially, Taiga gets upset easily. She is also brutally honest, typically when she is lashing out at someone. Due to her cute looks (described as a doll by Ryūji), she often gets confessions of love by boys, but she turns down every one of them, including Yūsaku Kitamura (which she later regrets). She is clumsy and tries to hide that too; it seems that only Ryūji has observed it.Despite coming from a well-to-do family, her life with them is very difficult because of various problems. She had lived with her father and step-mother and constantly fought with her parents, but she moved out and since then has taken to living on her own. Since she came from a privileged household, she does not know how to do any domestic chores. Near the end of the story her father's business goes bankrupt and he runs away, leaving Taiga in the care of her mother who was already remarried and had a new family of her own and with which Taiga has difficulty getting along.When she meets Ryūji and learns of his domestic talents, she ends up relying on Ryūji to cook for her. Aside from sleeping in her own house, and going to school, she spends most of her time at Ryūji's house; so much so that she is considered a member of his family. At the beginning of the story, she is infatuated with his best friend Yūsaku Kitamura and gets nervous every time he appears around her. Due to this, Taiga and Ryūji team up to help each other get into a relationship with each other's best friend. Though she treats Ryūji badly at first, her feelings begin to change as she spends more time with him.