Sixteen-year-old urbanite Hairi Takahara arrives on the remote island of Torishirojima after his grandmother's death. While ostensibly assisting with her estate, his true aim is escaping unresolved trauma. Once a dedicated competitive swimmer, a critical failure during a major competition—where he choked under pressure and cost his team victory—ended his promising career. This led to severe aquaphobia, preventing him from swimming. Subsequent shame and avoidance behavior caused him to skip school, associate with delinquents, and face arrest after a street brawl. These events triggered his parents' divorce, with his father blaming him for the family's dissolution. Socially awkward from attending an all-boys school, his curiosity about the opposite sex occasionally leads to accidental perverted situations, like walking in on girls changing. He habitually shouts his own name aloud for self-motivation or reprimand. Despite his urban background, he possesses spiritual sensitivity, enabling him to perceive supernatural entities like shichieichou (memory butterflies) invisible to most islanders. He also has an unusual affinity for attracting fish, making him exceptionally skilled at fishing. His island relationships drive significant personal growth. With Shiroha Naruse, he forms a bond helping both confront their fears—her precognitive abilities and his aquaphobia. Their relationship evolves into a deep emotional connection, and in a potential future timeline, they marry and have a daughter, Umi. After Shiroha dies during childbirth, attributed to overusing her powers to protect Umi, he becomes a neglectful father, consumed by grief and distancing himself from Umi. This future version forbids connections to Torishirojima, fearing Umi might inherit Shiroha's cursed abilities. Interactions with others further shape his development. He acts as a supportive figure for Ao Sorakado in her quest to recover her sister's memories, aids Kamome Kushima in fulfilling her childhood dream of finding a pirate ship despite her chronic illness, and helps Tsumugi Wenders resolve her existential crisis tied to the island's legends. His caregiving emerges strongly in the Alka route, where he and Shiroha temporarily care for Umi, fostering maturity and responsibility. Umi, his daughter from the future, travels back in time, becoming a catalyst for his emotional healing, helping him reconcile his traumatic past and paternal failings. His character arc culminates in the Pocket route, where he plays a crucial role in resolving the island's central mysteries. He aids Umi in altering timelines to prevent Shiroha's acquisition of her powers, an act risking Umi's existence. This reveals his deep connection to the island's supernatural elements and underscores his self-sacrificial nature. In the expanded Reflection Blue narrative, these efforts lead to a restored timeline where he and Shiroha raise Umi together, symbolizing his full emotional recovery and redemption. Notable traits include his deadpan snarking as a defense mechanism, gradual improvement in cooking skills through Shiroha's guidance, and eventual partial overcoming of aquaphobia—though he remains uncomfortable in deep water. His journey reflects themes of escapism, healing familial bonds, and confronting unresolved guilt.