Nagi Kitayama is a cheerful and straightforward high school freshman who approaches activities with full enthusiasm and innocent commitment, diving eagerly into every endeavor. Her immense curiosity about classmate Akari Yashima's mysterious aura drives Nagi to initiate their friendship.

Fascinated by Akari's reserved nature, Nagi reaches out and becomes her travel companion across Japan. During their journeys, Nagi exhibits a strong focus on fully experiencing and savoring each trip moment, contrasting sharply with Akari's initial preference for efficient destination-focused travel. Nagi's determination to create lasting memories through exploration gradually shifts Akari's perspective.

In the Kyoto Chapter, Nagi's insistence on complete immersion in sights and activities pushes a frustrated Akari to adjust her pace. This immersive approach helps Akari begin appreciating the journey's intrinsic value, marking a subtle change in their dynamic.

Nagi possesses brown hair and embodies a spirit of youthful adventure. Her interactions and travels with Akiri form the core of their shared experiences throughout Japan.