1girl, animal ear fluff, animal ears, bangs, blue archive, bottle, from behind, gym uniform, hakkinnpt001, halo, headband, long hair, mari (blue archive), mari (gym uniform) (blue archive), nape, neck, official alternate costume, orange hair, see-through, see-through shirt, shirt, simple background, solo, sweat, upper body, water bottle, white background, white headband, white shirt