Sekai no chûshin de, ai o sakebu (2004)

In 1980s Kyushu, two teenagers fell in love, and exchanged their secrets and thoughts by way of sending tape recordings to each other. More than a decade later, the boy (now grown-up and bittered) rediscovers the last recording of his long-dead lover's voice. Her words trigger a series of flashbacks illustrating the joyful beginning and tragic end of their relationship.