Nami stands among the four women Sasamatsu Kojuurou (known as Musashi) pledged to wed during childhood, a vow he later forgot due to amnesia. She harbors unwavering affection for Musashi despite his memory loss, experiencing no distress over his forgotten past. Her dedication to their childhood oath has only intensified across their fifteen-year separation, fueled not by tradition alone but by profound, genuine love.

She personifies traditional virtues through consistent kindness, courtesy, and steadfast loyalty. Her devotion extends beyond Musashi to deep bonds with friends Anzu, Suzaku, and Mayuki. Notably, she openly shares intimate details of her relationship with Musashi, including their first night together, and voices no objection to her friends pursuing similar connections with him. This transparency reflects her embrace of their collective ties.

Nami inherits supernatural lineage as a Youkai, specifically the Dragon King’s daughter. Her transformation manifests as two horns crowning her head and eyes tinted yellow. These horns function as intensely erogenous zones; gentle touch can trigger overwhelming ecstasy, binding her mystical essence to physical and emotional sensation.

In "Zoku Koihime," set six months after the original events, Musashi succumbs to renewed amnesia, forgetting Nami and the others again. He encounters Nami and his childhood companions upon returning to their snow-locked village, where unexplained phenomena unfold.