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.