Remember how Yuuri said she was going to get serious in the summer? Well, this episode takes place in summer. The second episode adds on to the ending of the parent show. The first episode recounts how Futaba slowly and innocently falls in love with Kou. Unlike a lot of run of the mill OVAs, this is not a filler between seasons it actually adds substance to the show as a whole. Maaya Uchida sure can go through her hiragana tables quickly. The VAs are identical to the main show, expect a strong performance throughout. The background music is identical to the parent show, some of the tunes are instantly recognizable it was utilized to outstanding effect to end the prequel episode. There aren't any OP/EDs in this OVA, there are end credits but it's just played over BGM. Much volume! Expressions and emotions are great in this show overall, middle school Futaba's innocence is really well represented.
Not too much to add in this section, feels just like the main show. I recommend watching this after the main show, even though chronologically the first episode of the OVA comes first, because it messes up some of the foreshadowing and character exposition in the main show. It definitely feels just like the parent show- simple and sweet. This is a great little add on to the Ao Haru show, it literally "wraps" the main story with episode 1 being a prequel of sorts and episode 2 being an add on after the occurrences in the main title.