1girl absurdres ahoge armpits beach bikini blue_archive blue_eyes blush caustics day eyewear_on_head fang foot_out_of_frame frilled_bikini frills goggles goggles_on_head highres horizon hoshino_(blue_archive) hoshino_(swimsuit)_(blue_archive) lilithmy long_hair looking_at_viewer navel ocean official_alternate_costume one_eye_closed open_mouth outdoors pink_hair pool poolside smile soaking_feet solo stomach sunglasses swimsuit twintails very_long_hair water waves white_bikini