A medium shot, eye-level anime illustration depicts a 14-year-old girl and her 9-year-old brother standing together inside a swimming pool, with the water reaching their waists. The girl, possessing a blend of purity and vibrancy, has long black hair and a bright, affectionate expression; she wears a white two-piece swimsuit adorned with delicate frills and a thin, translucent white hooded parka draped over her shoulders, her hands resting gently on the water's surface. Beside her, the younger brother has feminine features and long hair reaching below his shoulders, wearing a navy blue rash guard with pink lines and a small girl-oriented character print on the chest, paired with loose-fitting swim trunks; he looks up at his sister with a shy, sweet smile, gripping the edge of her parka with one hand. The setting is a bright indoor pool with shimmering turquoise water, white tiled walls, and soft reflections dancing on the surface. The scene is filled with bright, natural lighting and a clear, saturated color palette, evoking a heartwarming, innocent, and refreshing summer atmosphere.