[grevierr]

Guys you need to stop breaking the fifth wall. Don't assume whats shown on screen is everything, and dont think what we see is made known to all the characters.

At what point is there a conversation where Yui is made to know about Yuuya's past? She can only tell he is of Japanese descent, brought up in America. Nothing more and nothing less. She made the assumption that he was brought up with knowledge of Japanese culture values, which was her first mistake, since assuming makes an ass out of-u-and -me. Of course, having a surbordinate who shows hostility from the start doesn't help matters.