Age: 18 (17 chapters 45 to 159, 16 prior to chapter 45)

Birthdate: August 26th

Blood type: A

Club: Girls' Basketball Club

Uniform Number: 10

A second-year attending Eimei Senior High School as well as a member of the girls' basketball team. Her likable personality and prowess in sports make her one of the most popular among her schoolmates. While she's mostly known as a laid-back student, Chinatsu is secretly quite competitive, as she frequently arrives to practice at the gym in the morning even earlier than Taiki Inomata.

Due to her parents moving overseas for work, Chinatsu's mother sends Chinatsu to stay with the Inomata family since Taiki's mother and Chinatsu's mother used to be teammates in high school.

Chinatsu's favorite food is Oyakodon, but she also likes omurice just like Taiki.

Chinatsu has a tendency to appear out of nowhere behind Taiki and startling him, her own little way of messing with him.