Matsuri trains as a young ninja cadet within a group undertaking a critical final examination mission: infiltrate the Kabusu-occupied Byakuro castle and retrieve a hidden sacred scroll. Unknown to most cadets, one among them is secretly the Byakuro clan's infant princess, rescued years ago after a Kabusu attack and raised in hiding. Aware the princess hides within the cadet group, the Kabusu clan hired skilled mercenary ninjas to pursue them.

Matsuri operates alongside fellow cadets Sakura, Pochi, Hayashi, Yume, and their instructor Kaoru. During the infiltration, the team splits into pairs. Matsuri employs practical ninja skills in operations, utilizing smoke bombs to create diversions and facilitate escapes for herself and teammates when confronted by guards at enemy checkpoints, reflecting standard shinobi tactics focused on stealth, evasion, and supporting the team objective.

A major challenge arises when the cadets encounter three Kabusu-affiliated ninja mercenaries at a checkpoint. One mercenary specializes in summoning techniques, deploying minor creatures against the cadets. When these prove ineffective, the mercenary performs a self-sacrificial ritual to summon a giant spider demon capable of spraying deadly acid. Matsuri participates in the battle against this creature alongside her teammates. The cadets combine their efforts, culminating in a powerful explosive attack that destroys the spider demon.

Amidst the checkpoint ruins after the battle, Sakura questions if she might be the lost princess, though the true princess's identity remains unresolved. Matsuri's specific background, lineage, motivations, or personal development beyond her role within the team mission are not elaborated upon. Her participation concludes with the team standing together after overcoming the summoned threat.