1boy, azit_(down), ball, beachball, blonde_hair, blue_sky, hood, hooded_jacket, hoodie, jacket, male_focus, male_swimwear, navel, open_mouth, outdoors, project_sekai, short_hair, sky, solo, stomach, swim_trunks, tenma_tsukasa, tongue, watermelon_beachball, yellow_eyes, yellow_jacket