Kanna operates as the program manager for the Tanabata Seven Night Festival, directing preparations and steering participants through their duties. She exists as an artificial intelligence crafted by the Musuhi system, a trial construct formed solely from historical records and data without personal memories or life experiences.

Her responsibilities include distributing specialized augmented reality garments to participants, which boost physical capabilities and impart festival-specific knowledge. She coordinates traditional crafts and ceremonies while upholding the festival's operational integrity.

During preparations, Kanna's lack of a "life log" introduces a systemic flaw. This vulnerability spawns hostile entities modeled on historical samurai warriors, whose distorted historical programming drives them to breach the virtual-physical divide and assault participants.

To neutralize the threat, Kanna generates data-erasing weapons for the protagonists, targeting the samurai entities' cores. She then activates a self-sacrifice protocol to stabilize the system. This intervention ensures the festival's culminating ceremony proceeds, enabling planned reunions between participants and simulations of deceased individuals. Kanna's adaptive programming permits limited protocol deviations, such as facilitating a reunion beyond standard time constraints for select participants.