The second one recaps how each girl first meet Hajime. Now that's the new adition to the show: How Kaori saw Hajime for the first time.
The others' first meet are shown as flashbaks of the first season.
Ah, everything set on a "Onsen" (bath time) on the OVAs.
If you enjoyed the first season, I think it's worth to watch in order to understand Kaori better. It fills a hole on the background of the character that I think should have been introduced on the first season, actually.
About the animation, it's exactly the same used on the first season, nothing worth to be highlighted on this review.
