Seventeen-year-old Tora Hayashi has always been irresistibly drawn to the ocean, lulled by the dream of becoming a pearl diver like her free-spirited, adventurous mother. But when their family moves to Tokyo, Tora’s beloved Okaasan becomes increasingly withdrawn, opening up an impassable chasm between mother and daughter. Then Tora’s mother vanishes in the middle of the night, taking only her most precious possession: a pearl-white diving suit, locked away when they left Miyako. Believing that Okaasan may have returned to the sea, Tora persuades her best friend, Sakura, to accompany her back to their coastal hometown under the guise of a spring break trip. There, Tora begins to unravel a…