Where had Dr. Sadao first met his wife? What had been his initial reaction?

Sadao had met Hana at an American professor’s house. The professor and his wife had been kind people. They wanted to do something for their few foreign students. Sadao had almost not gone to Professor Harley’s house that night. But when he went there, he had found Hana, a new student, for whom he developed a liking but he had waited to fall in love with her until he was sure she was a Japanese.