A freshman at Kotaro's school and a rising star on the diving team, Mana has an air around her that makes her difficult to approach. She never laughs and never socializes with anyone but her coach. When Kotaro gets to know her, he finds that she's actually a bit of a romantic. She has a deep love of the water and enjoys fairy tales about mermaids. When Kotaro finds out that she is somehow tied to Kaho's accident, he begins an uphill struggle to break through her antisocial barrier and become her friend.