sumino takumi, the hundred line -last defense academy-, artist request, chinese commentary, commentary request, highres, second-party source, 1boy, buttons, cropped shoulders, greyscale, hair between eyes, high collar, jacket, last defense academy school uniform, male focus, monochrome, multicolored hair, open mouth, school uniform, short hair, simple background, sketch, solo, streaked hair, two-tone hair, watermark, weibo watermark, white background