Now that Henry's found what he wanted, he goes with Marty and Samantha to the Asian grocery store so Samantha can pick up some things to make them all a Chinese dinner.
Marty and Henry wait outside while she goes inside, and Marty asks him who this Japanese friend of his was—and how Henry's father felt about the whole thing.
Marty's especially shocked that Keiko was a Japanese girl, and he immediately wonders if she was Henry's girlfriend.
Henry tells him that dating wasn't really a thing back then, and besides, he and Keiko were just kids. But then Marty asks him if Ethel knew about Keiko… and Henry reveals that yes, she did.
As they're talking, Samantha returns and says that she's making black-bean crab, choy sum, and they're having green tea for dessert. Looks like someone's gunning for some serious brownie points from her future father-in-law.