In the anime-only special "One Piece Jidaigeki Special: Luffy Oyabun Torimonocho," set in an alternate feudal Japanese universe, Nami adopts the alias Onami. She co-owns the restaurant "The Pinwheel" with Sanji, a central gathering spot for characters. Onami repeatedly voices irritation over patrons, particularly Luffy, who consumes excessive food without adequate payment.

When Buggy's Clown Family gang threatens the town, they abduct Onami to lure Luffy into a trap, leaving a demand for his solo rescue at the river. Sanji intervenes, defeating her captors to save her. Later, Onami tends to the injured Princess Vivi at the restaurant after Vivi suffers wounds from the Clown Family.

Onami's interactions reflect her financial pragmatism, as she runs the business and reacts sharply to monetary losses. Her supportive role provides shelter and aid during conflicts. The special concludes with her managing the restaurant while implicitly tolerating Vivi sneaking from the castle to revisit the town.