1boy, solo, Shuuyu_Koukin, male_focus, black_hair, school uniform, white shirt, short sleeves, red necktie, sweater vest, fighting stance, classroom, smile, upper_body, black_pant, best quality, amazing quality, standing, angle, martial_art, (aged up:1) masterpiece, standing, angle, martial_art, (anime_screencap:1.1)