So he just happened to have tickets to watch something that relates to her hobby and thought "meh might as well ask Rin" you know the girl that asked him to go on a date not to long ago
this man is making big brain plays, that or even the gods ship them
"So, I'd like to ask you for permission for your daughter to go see a play with me, the play will be held on Kyoto. Also would like to ask for your blessings for our wedding there, I already arranged everything with my parents"