amanchu! aqua_hair artist_name ass blue bodysuit bubble copyright_name coral coral_reef diving diving_mask diving_mask_on_eyes diving_regulator diving_suit fish flippers from_behind from_below green_hair holding_hands kohinata_hikari logo looking_back multiple_girls ocean ocean_bottom ooki_futaba perspective ponytail school_of_fish scuba scuba_gear scuba_tank snorkel swimming underwater wetsuit whale wox