mendokusai (めんどくさい): tiresome

bother(some) to do, tiresome
Mariko-san: wasteful

tejaku (てじゃく): pouring one's own drink

helping oneself to a drink, pouring one's own drink

ichigo ichie (一期一会): once-in-a-lifetime encounter

There is certain destiny to see someone else.
Once-in-a-lifetime encounter (hence should be cherished as such)

oshyoushina (おしょうしな): "thank you" in Yonezawa