Great episode very good balance of being a slice of life and comedy episode. My favorite being when Azu-nyan, and Yui were "studying":
Spoiler for Studying Scene:
Azusa: Have you solved the practice problems?
Yui: Y-yeah.
Azusa: Then let's check answers.
Yui: But...
Azusa: Something wrong?
*Azusa looks at Yui's "answers" that is a drawing of Azu-nyan with Cat Ears*
Azusa: Be more serious.
Yui: I'm so Sorry.
I laughed so bad when I saw Azusa's reaction to Yui's drawing
.
Also YuiAzu, and RitsuMio both sound good to me
.