1girl arm_up armpits brown_hair crop_top hand_on_headwear hat hayami_ayumi kiyama_satoshi long_hair low_twintails one_eye_closed open_mouth school_swimsuit school_uniform serafuku shirt sketch sleeveless sleeveless_shirt smile solo submarine_707r swimsuit swimsuit_under_clothes twintails upper_body white_headwear white_shirt
1girl armpits arms_up brown_eyes brown_hair casual_one-piece_swimsuit full_body hayami_ayumi highres jacket legs long_hair low_twintails oka_shouhei one-piece_swimsuit open_mouth outstretched_arms ribbon running sandals sleeves_past_wrists smile solo submarine submarine_707r swimsuit toes twintails underwater watercraft white_swimsuit yellow_jacket