Moglie di Okina, also called the Bamboo Cutter's Wife, Ona, or Ounaa, is an elderly peasant woman sharing a humble rural life in Japan with her husband Okina. The couple endures deep sorrow from their childlessness until Okina discovers a miniature girl within a glowing bamboo stalk. She reacts with instant maternal joy, embracing the tiny child as heaven-sent. Naming her Kaguya-hime, the couple raise her lovingly despite her mysterious origins and unnaturally rapid growth from infant to adult.

Her parenting contrasts with Okina’s growing ambitions. Though grateful for the wealth brought by bamboo-stalk gold, she prioritizes Kaguya’s emotional well-being over social climbing. She quietly worries when Okina moves them to the capital to mold Kaguya into nobility. In their lavish mansion, she observes Kaguya’s distress during Lady Sagami’s strict etiquette lessons, often showing silent anxiety or helplessness as Kaguya strains against aristocratic constraints.

Her pragmatic compassion surfaces amid Kaguya’s marriage trials. She shares Kaguya’s anguish over deceptive suitors and their doomed quests. Witnessing Kaguya’s moonlit melancholy, she grows alarmed by her daughter’s emotional withdrawal and erratic behavior, unaware of its celestial cause.

Learning of Kaguya’s impending return to the Moon, the Bamboo Cutter’s Wife is shattered. She desperately pleads for Kaguya to stay and physically shields her during the celestial procession’s arrival. Her grief peaks as moon beings prepare Kaguya for departure. She refuses the offered immortality elixir, seeing no value in eternal life without her daughter. After Kaguya ascends in a memory-erasing robe, the Bamboo Cutter’s Wife collapses in profound sorrow beside her husband, her role as devoted mother ending in irreversible loss.