Tomoyo transferred to Tomoya's school as a second year student during spring. Although Tomoya is older than her, Tomoyo does not show him his due respect as a senior student. She has a younger brother named Takafumi (鷹文). She is rumored to be violent and to have a misconduct record for fighting. These rumors are later confirmed, when she beats up several delinquents from her previous school at a day during school hours. Youhei challenges Tomoyo, unable to believe what he saw. After several meetings with Tomoyo, Tomoya learns from Tomoyo that she wants to be a student council president, and later, her reason of wanting to be one. In the Movie

A high school student who suffers a pancreatic disease, has her lifespan dramatically shortened. She has a diary called "Living with Dying" where she writes about her daily experiences since her illness was first diagnosed. Despite her situation, she keeps her smile and even jokes about it.