Story: 5/10. Beach episode is so standard, and only usual jokes about guns helpa this story. Art: 10/10. Sunrise and the night sky are both outstanding. And, of course, we have the art style usual for this series, which I personally like. Sound: 9/10. Classical music at fanservice swimming scene made me LOL several times. Character: 9/10. OVA keeps traditions of ONA, so all girls-guns are fantastically cute. ^__^ Enjoyment: 10/10. On can argue about boobs fanservice in this OVA (at that scene characters looks much older than in ONA), but I personally enjoyed this show. It was very logical to do such a pleasure for Upotte fans withthis episode: many of them wanted funny situations with schoolgirls, and here they are! The main thing is that it looks cute, but not vulgar.
Overall: 9/10. In my opinion, Upotte ONA is one of the best in slice-of-life genre, and this OVA is a brilliant end for this great show.