At least that's the take at Lost in America:
As we know [Urobutcher] wrote only the first and last episodes of the series, and to what extent he was involved in what came between I don't know. But this OVA in particular is completely devoid of anything remotely resembling contemplation or reflection - there isn't a whisper of moral or ethical conflict here, or any real character drama.
He's saying it as if it's a bad thing.
About the best moments in the OVA come when first Amy and later Ledo reflect on Chamber's profound influence on both their lives.
Somehow, I'm not surprised (at this assessement).
The OVA was supposed to come on the November 21st, so this is a week early.