Seeing the whole crew for me is enough to take me on a feels trip. Story-wise not much really its all about Kon and Tanbabashi's little bro misadventures. Nothing really contributes to the character's development I'd say still the same but that does not mean it not enjoyable. Art & Sound quality is the same as the series. Heartwarming scenes couple with relaxing music almost always never fail. Even if I said that it's all the same as the series I really enjoyed the OVA. It's more like remembering how you like the series in the first place and reminds you how much you miss them.