Seiji Koshiba

Kiri's father owns the Koshiba Beauty Salon and was the one to train Kiri in the art of hairstyling. Seiji used to be an idol among hairstylists in his generation and always defeated Shogo Narumi's father in competitions, but left the spotlight once he got married. Kiri looked up to her father when she was younger and wanted to cut hair like him. Kiri gained her speed cutting skills from her father. Seiji wishes for Kiri to become a beautician like him. Source: Wikipedia