Kaori Senozawa is Shiori Senozawa's older sister. Her naturally sociable disposition consistently makes her the center of attention, a magnet within any group. She works part-time at her family's toy store, reflecting her connection to familial roots and daily responsibilities outside the festival's extraordinary events.

Kind and gentle, Kaori possesses a deep-seated concern for others, fostering strong bonds and making her cherished among friends. Despite an outwardly innocent appearance, she harbors a profound fascination with the supernatural, particularly ghost stories and haunted locations. This curiosity drives her to actively seek out and explore such rumored places.

Her inquisitive nature directly catalyzes her involvement in the central events of the Nanaya Festival. Driven by this curiosity, she encounters Akihito, a mysterious figure appearing in her dreams who extends an invitation to the festival. This encounter propels her deeper into the unfolding narrative. As she delves further, she uncovers layers of complexity beneath the festival's surface celebrations, learning about its ancient rituals and confronting the hidden, darker secrets within its traditions. These revelations fundamentally alter her understanding of the event and her role.

Facing increasingly perilous situations, Kaori is compelled to make difficult choices, relying on her innate courage and deep compassion to navigate adversity. Her journey explores profound themes of friendship, love, and human resilience when confronting loss and existential challenges. The festival's purpose—enabling participants to reconnect with deceased loved ones through advanced technology—directly shapes her motivations, experiences, and personal arc within this environment.

Her entire documented journey, from her everyday life and personality to her transformative experiences at the Nanaya Festival, unfolds solely within the context of the original net animation.