It doesn't contribute with anything to the main story.
It is incoherent and disconnected since the multi-verse sequences do not make any sense at all.
It helps nothing to further understand the characters.
To be honest, there is only one word that can describe watching this OVA : pointless.
I honestly do not have much to add to this short review, the OVA is nothing more than that : pointless, pointless, and pointless.
The other problem with the sequences is that they are repetitive which makes you wonder "why do we have to go over this again ?", beyond the change of background they do not change anything to the sequence.
