Mika is Takumi's current girlfriend in the Project D story arc. She first met him after confronting him for blowing off her friend which was in fact a guy posing as Takumi. After settling this she apologizes to Takumi and they begin to see each other more.
Mika Uehara is a senior in high school in Saitama and is exceptionally talented at playing golf. Her father has raised her to play golf early in life similarly as Bunta raised Takumi to drive.
Mika Uehara was created by Shuichi Shigeno she first appeared in chapter 428 of Initial D which is collected in Volume 32.
She first meet him in the Project D Story Arc when the impostor Takumi and Keisuke where going around various towns gloating about their skills and trying to pick up women. Mika's friend Tomoko was blown off by the fake Takumi to which she decided to meet Takumi in person and rides a train to Yuichi's gas station and encounters Takumi's friend asking to meet him. When he arrived she slaps him hards in the face leaving Takumi bewildered. After learning what really happened and trying to prove his innocence asks her to send a photo of Takumi to her friend Tomoko. Tomoko revealed that the Takumi Mika met was not the one she encountered.
After Takumi and the members of Project D confronted the Impostors and humiliated them, he decided to drive to Saitama to see Mika. She apologizes to him for her previous actions and they begin talking for several hours. After exposing the imposters, the Fake Takumi apologizes to Mika's friend. Mika thanks Takumi and they continue to see each other more.