2boys, 3girls, aged_down, ajiro_shinpei, backpack, bag, bare_legs, barefoot, beach, breasts, brother_and_sister, child, chinese_text, closed_mouth, cloud, comic, full_body, greyscale, guihuafu81230, hand_on_another's_back, hishigata_sou, hishigata_tokiko, holding, hug, island, kofune_mio, kofune_ushio, long_hair, monochrome, mountain, multiple_boys, multiple_girls, one-piece_swimsuit, open_mouth, outdoors, sad, shirt, short_hair, short_sleeves, siblings, smile, speech_bubble, standing, summertime_render, swimsuit, walking, water