Nagisa Furukawa originates from *Clannad* and appears in *Kaginado* with a chibi design. Her core personality persists: shy, kind, and occasionally self-deprecating, she motivates herself by whispering food names like "anpan" and retains her habit of loudly singing the *Dango Daikazoku* song for comic effect. *Kaginado* references her *Clannad* background, including her chronic illness causing repeated high school years, her resolve to revive the drama club, and her eventual marriage to Tomoya Okazaki. Their relationship here diverges at times—Tomoya once expresses regret over meeting her and jokingly alludes to her death, though later episodes show them cuddling and holding hands on a bus, implying reconciliation. Their daughter Ushio observes planetarium sequences alongside Yumemi Hoshino. Nagisa interacts with characters from other Key franchises, joining a school-wide cultural festival where she sings onstage, encouraged by Tomoya and her parents. Her role is primarily comedic, involving misunderstandings or playful clashes, such as with the *Angel Beats!* group's attempts to disrupt the world. Despite limited focus, her story elements—parental support and ties to *Clannad*'s Illusionary World—surface through visual gags and dialogue. Her portrayal leans into parody, amplifying her politeness and naivety for humor while upholding her identity as a central heroine. The series avoids new development, instead offering comedic spins on existing arcs like hospitalizations and family dynamics. She integrates into ensemble scenarios—beach trips or school contests—where her interactions support crossover-driven humor.