3boys, 6+girls, :d, ^ ^, aldehyde, arms behind back, bangs, blush, chair, closed eyes, closed mouth, collared shirt, comic, desk, dress shirt, furigana, grand piano, greyscale, hand up, indoors, instrument, monochrome, multiple boys, multiple girls, necktie, on chair, original, parted bangs, piano, sailor collar, school chair, school desk, school uniform, serafuku, shirt, sitting, smile, standing