Basically, it is the same structure as the series were. However, as this is an ova it does not contribute to the plot. Ayumu is stuck in a mess after going about his daily normal life again. This OVA lets the watcher let loose and just have fun. Great comedy, art, sound and animation. It has little fanservice but it is mainly to benefit the comedy of the OVA. It is definitely a worthy watch if you enjoyed the original series. However, if you dislike the comedy and are searching for a nice story ( IMO it is a nice story:p) with a lot of complications thisis not it.