Takaki Tōno's first girlfriend is an unnamed character in 5 Centimeters per Second manga and 5 Centimeters per Second novel.
Background[]
Takaki's girlfriend at the canteen
Coming from Yokohama, she was around the same age as Takaki Tōno and worked at the canteen of Takaki's university. They dated for 6 months. She was the first woman that Takaki slept with.
She and Takaki usually had lunch together, when she often complained that he was eating too quick. Feeling that Takaki did not love her as much as she did, she broke up with him after another man confessed his love with her.