Youta Narukami, a 17-year-old high school student with black hair and piercing blue eyes, dresses in layered shirts, hoodies, black pants, and casual shoes. The son of Daichi and Tokiko Narukami and protective older brother of Sora, his name embodies celestial themes: "Youta" merges characters signifying "light," "sun," "male," and "greatness," while "Narukami" means "becoming a god" or "thundering god."

Beginning as an aimless teen indifferent to studies, he fills his days with video games and pines quietly for childhood friend Kyouko Izanami, whose teasing references to being his "girlfriend" trigger flustered denials. His routine fractures when Hina Sato arrives, a self-proclaimed deity predicting global collapse in 30 days. Skeptical yet intrigued, Youta partners with her to fulfill strangers’ wishes, uncovering joy in small human connections.

Gradually shedding passivity, he intervenes in others’ lives—reviving a ramen shop, competing in mahjong to inspire a fan, and aiding Sora’s film ambitions. His bond with Hina deepens, fostering empathy that redirects his affection from Kyouko to the enigmatic girl. This shift crystallizes when Hina’s secret surfaces: her Logos Syndrome, a neurodegenerative disease stalled by a quantum chip implanted by her grandfather. Government agents seize the device, accelerating her decline into mute immobility.

Devastated but resolute, Youta traces Hina to a care facility, rekindling her awareness through shared memories. Vowing to cure her, he channels grief into purpose, committing to medical research. His parents openly welcome Hina, while Sora evolves from suspicion to collaboration, mirroring Youta’s loyalty and defiance of societal limits.

The story closes on Youta’s quiet determination to safeguard Hina, embracing impermanent moments as anchors against loss. His journey—from hesitant adolescent to driven protector—cements resilience and the transformative power of selfless love.