Mt. Ishizuchi, island of Shikoku, 1932. Leading a simple, sheltered life with her grandmother in the bosom of her small, isolated mountain community, 13-year-old Rin finds herself forced to do on her own when a duplicitous stranger talks her into following him. As Rin struggles to find her feet in Mitarai village on the Seto Inland Sea island of Osaki Shimojima, a cruel life awaits her at her new home, a cheap brothel on the waterfront. But now it's too late, and rebellion can only do more harm than good. If she works hard and pays off her debt, will Rin get to see her home again?