Akashi is a multigenerational love story told across parallel timelines. Kana, a struggling artist in Vancouver, returns to Tokyo for her grandmother’s funeral, feeling out of place after ten years abroad. As she reflects on a secret only she and her grandmother shared—that her grandfather had another lover—she unexpectedly reconnects with an old love, Hiro. Intercut with the past, which traces her grandfather’s decades-long affair, Kana confronts hidden family truths and begins to navigate the complexities of love, sacrifice, and the choices that shape a life between desire and duty.

Akashi Kanpei is a former police officer who works as an auctioneer at a fish market near a fishing port in Mie-ken. After divorcing his wife Chieko, he has been living a carefree single life. One day Chieko's daughter Hideko suddenly appears before him, and he moves to Tokyo upon being invited by her. He then ends up living with Hideko, Chieko, and Chieko's current husband and his younger brother.