A second-year student at Hatowa Private Business Senior High School. He's a charismatic and cheeky fashion magazine model. Mizuki always has people around him, and is a central figure in his class. Haruho met him during the summer holidays when she was in her third year of junior high school. She was staying with her grandmother in Okinawa, where she meets Mizuki. Mizuki had come from Nagasaki Prefecture just for a visit. [Partial translations of both Photograph Journey's profiles of him.]