Sunao's Tsukumogami sword, Kotetsu, is not awakening after his hilt was repaired, as his spirit energy is too low. Sunao asks Kazuya and Kiriha to travel with her to the Cave of the Divine Navel to save Kotetsu. Sunao questions her relationship with Kotesu, tainted by her treating him like a mere tool and blaming him for her brother's death.