tachibana_hiroki, drum_(kancolle), year_2024, 1girl, ahoge, ass, black_one-piece_swimsuit, blonde_hair, blue_sky, cloud, cowboy_shot, finger_to_mouth, from_behind, grey_eyes, headgear, jacket, looking_at_viewer, one-piece_swimsuit, sky, solo, star_ornament, swimsuit, swimsuit_under_clothes, white_jacket, , kantai_collection