2girls aile ass back bare_shoulders barefoot blush blush_stickers brown_hair cable caustics eyebrows_visible_through_hair feet from_behind goggles goggles_on_head green_eyes hands_on_own_face ladder looking_back lurerre mermaid monster_girl multiple_girls one-piece_swimsuit partially_submerged pool pool_ladder robot rockman rockman_zx school_swimsuit shigehiro_(hiroi_heya) short_hair sitting soles swimsuit toes underwater wading water