6+boys, 6+girls, akamatsu_(etra-chan_wa_mita!), akane_(etra-chan_wa_mita!), aqua_hair, azami_(etra-chan_wa_mita!), ball, beachball, bikini, black_bikini, black_eyes, black_hair, black_male_swimwear, blonde_hair, blue_sky, blush, bob_cut, braid, breasts, brown_hair, brown_male_swimwear, brown_sarong, casual_one-piece_swimsuit, cleavage, closed_eyes, closed_mouth, cloud, collarbone, day, dolphin, double_bun, dress, etra-chan_wa_mita!, etra_(etra-chan_wa_mita!), everyone, glasses, goggles, goggles_on_head, green_eyes, green_hair, green_one-piece_swimsuit, hair_bun, hiiragi_(etra-chan_wa_mita!), holding, holding_ball, holding_beachball, holding_hands, holding_innertube, innertube, john_(etra-chan_wa_mita!), karin_(etra-chan_wa_mita!), katsura_(etra-chan_wa_mita!), kuroki_(etra-chan_wa_mita!), light_brown_hair, long_hair, looking_at_another, looking_to_the_side, male_swimwear, medium_breasts, medium_hair, multiple_boys, multiple_girls, muscular, muscular_male, navel, nyako_(lhq3p), ocean, one-piece_swimsuit, one_eye_closed, open_mouth, orange_bikini, outdoors, partially_submerged, pink_dress, pink_eyes, pink_hair, pink_innertube, polka_dot_innertube, ponytail, purple_hair, red_bikini, red_eyes, red_male_swimwear, riding, sarong, short_hair, single_braid, sky, sparkle, standing, sun, surfboard, surfing, swimsuit, tachibana_(etra-chan_wa_mita!), tokusa_(etra-chan_wa_mita!), topless_male, tsutsuji_(etra-chan_wa_mita!), undercut, virtual_youtuber, water, water_drop, waving, yuri_(etra-chan_wa_mita!), yuzuriha_(etra-chan_wa_mita!)