一松

Izui's older brother who came back from studying in America. He's a bioengineer.
He looks almost identical to Izui, but personality-wise, they are total opposites. They don't get along too well. Unlike Izui, he's warm, friendly and easy-going, though his mannerisms seem fake. He constantly peppers his speech with Engrish and insists that people call him Jackie. Even though he's the older brother, he's a bit shorter than Izui. He gives supplementary English lessons at Togai Private High School. He's dating Hanako.