| Kozu Masahiro | |
| |
| Gender | Male |
| Hair | Black |
Masahiro Kozu is a bright student and since their fathers knew each other, Masahiro became Mikoto's tutor when she was in middle school. She soon came to admire his hard-working nature and dedication, and inspired her to try harder and improve in her studies, allowing her to pass the entrance exams and entering the same high school as him. He later graduated and went to college, never knowing that Mikoto had fallen for him.