3boys, beach, black_hair, blue_eyes, brothers, buster_bros!!!, green_eyes, heterochromia, hypnosis_mic, jewelry, kisaragi_koubana, male_focus, male_swimwear, mole, mole_under_eye, multiple_boys, necklace, outdoors, red_eyes, short_hair, siblings, swim_trunks, swimsuit, yamada_ichiro, yamada_jiro, yamada_saburo, yellow_eyes