Suna no ue no Koibitotachi (1999)

Original title: 砂の上の恋人たち

While vacationing in Australia, Nagase Tomoya, his girlfriend Kanno Miho, and friend Okina Megumi cross paths with Honjou Manami. A tragic accident occurs when Manami accidentally hits Miho with a dune buggy. Though Miho insists she's fine, she later dies from a head injury. Guilt-ridden, Manami struggles with the weight of her actions, while Nagase masks his growing feelings for her with anger. Okina seeks justice for her friend's death, unaware that the lawyer helping them is actually Manami's boyfriend. Amid guilt, grief, and conflicting emotions, Nagase and Manami find themselves drawn to each other in an impossible love that defies their circumstances.