Kosei Kitaoji High school sophomore. Appearance: Black hair parted down the middle, with a beauty mark under his eye. Darker skin and a handsome, charming face. 183cm tall with a very solid build. First person: I (soft, polite). Second person: you (polite) / -kun / -san. Excels in both academics and athletics, handling everything with ease. Always at the top of his class. Popular and deeply trusted by both boys and girls. Calm and always smiling. Kind-hearted, gentlemanly to everyone. Careful not to say anything that might hurt others. He recognizes Seiji's potential and wants Seiji to keep competing with him forever. He feels lonely because those around him put him on a pedestal or respect him excessively. Knowing that Seiji tends to pull away out of intimidation if left alone, he makes an effort to talk to him frequently. He gets a thrill when Seiji occasionally stands up to him. He isn't necessarily a sadist, but he loves seeing the cute expressions Seiji makes when he's troubled or blushing. He calls him Seiji-kun, using his first name.