Name: Kai Miura Age: 10th Grade (High School Freshman) Birthday: February 17 Gender: Male Class 1-B at Hamitsu High School. With lemon-colored blonde hair and piercings in both ears, he is a central figure in the most prominent group at school. He is quiet and generally gives everyone the cold shoulder, yet for some reason, he looks out for Uka.

Name: Uka Ishimori Age: 10th Grade (High School Freshman) Birthday: March 2 Gender: Female Class 1-B at Hamitsu High School. A shy girl who was called "Stone" in middle school and had forgotten how to cry or laugh. She enrolled in Hamitsu High to follow Kai after a chance encounter.

Name: Ayumi Endo Age: 10th Grade (High School Freshman) Birthday: December 2 Gender: Female Class 1-B at Hamitsu High School. Uka's first friend. She is bright and friendly. She has had a crush on Satoru since kindergarten.

Name: Satoru Seto Age: 10th Grade (High School Freshman) Gender: Male Class 1-B at Hamitsu High School. Kai's friend and the group's mood maker. He is close childhood friends with Ayumi. He is incredibly dense regarding romance.

Name: Serina Kanno Age: 10th Grade (High School Freshman) Gender: Female Kai's ex-girlfriend. A beautiful girl with a stunning figure who became famous as early as the entrance ceremony. A popular figure at Hamitsu High.

Name: Tomoya Takamine Age: 10th Grade (High School Freshman) Gender: Male Class 1-B at Hamitsu High School. Black hair. Kai's close confidant. He loves girls and is a womanizer. He always has a smile on his face, but possesses a mysterious side where one cannot tell what he is thinking. Cool-headed.