Sono Kao de Aisanaide

Nora, who works as a maid in a wealthy family's mansion, has a crush on Makoto, the son of the family. One day, however, Makoto dies in a sudden car accident. That is when Makoto's twin brother Nozomu, who had been adopted away as a child, returns to the family. Appearing before Nora in her grief, "Should I become Makoto for you?"

Same face, different person, a bittersweet love story!

(Source: Kodansha, translated)