Ushio Kofune, a 17-year-old from Hitogashima Island, embodies selflessness and courage. She perishes during a maritime accident while rescuing Shiori Kobayakawa from drowning—an act that underscores her bravery and impulsive protectiveness. Sporting long blonde hair, piercing blue eyes, and an athletic build, she is typically clad in a dark blue one-piece swimsuit and an oyster shell necklace, a cherished keepsake. Following her death, a shadow duplicate emerges, retaining her memories and fiery spirit yet unaware of her shadow existence. Clinging to the belief she’s human, she reunites with Shinpei Ajiro, her childhood friend and adoptive brother, fighting alongside him in a time-loop battle against predatory shadows. Gradually embracing her shadow nature, she harnesses her abilities to outmaneuver enemies, demonstrating adaptable combat tactics and strategic ingenuity. Her shadow physiology grants extraordinary abilities: replicating objects and human forms, healing wounds by resetting her data, and wielding her hair as a weapon or versatile tool. After resurrection, her powers expand to purge shadows permanently and erect defensive barriers. Her existence intertwines with Haine’s Right Eye, a time-bending artifact she later masters to rewrite reality and eradicate shadows in the final timeline. Her bond with Shinpei transforms from unspoken affection into a steadfast partnership anchored in trust. She grapples with accepting her existence as a copy, shielding her sister Mio, and confronting foes like Shide and Haine. Pivotal moments include tactical subterfuge in battle, conquering hesitation to strike decisively, and safeguarding memories through timeline resets, ensuring her bonds endure. Born to a Japanese mother and French father, Alain Kofune, Ushio was raised alongside Shinpei and Mio after her mother’s passing, forging a sibling-like bond. Her shadow’s legacy persists through pivotal actions that save Hitogashima, forging a world untouched by shadows and cementing her as a central figure in the island’s destiny.