Akane Shiina

The elder sister of Asahi, this spirited individual shares her younger brother's vibrant and energetic personality. While she frequently enjoys playful teasing and lighthearted banter with him during their childhood, her true nature is deeply caring. This devotion becomes clear during the relay tournament, where she emerges as a dedicated source of encouragement, providing heartfelt support for Asahi as he pursues his passion for swimming.