Naoki Kuroi

This street-smart and outgoing young man is Tatsuki's younger brother, possessing a good heart despite his flirtatious nature and self-proclaimed ladies' man status. His romantic interests have shifted over time, eventually focusing on Kasumi by the series' end. A passionate skateboarder, he occasionally works at their family's ramen shop with aspirations of taking over the business. Despite initial disappointment about his brother's choices, Naoki accepts Tatsuki's desire to forge his own path.