6+boys 6+girls absurdres akamatsu_(etra-chan_wa_mita!) akane_(etra-chan_wa_mita!) aqua_hair azami_(etra-chan_wa_mita!) ball bangs 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 commentary_request 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 highres 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 official_art 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 second-party_source 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!)