This is your average OVA with your average filler story. It' a side story with no bearing on the overal plot progress, there's no depth other than just being a stand-alone short story and no depth is really expected. This is mainly for people who just want *any* additional content with the characters they like.
The character design, especially for the main characters, makes them look somehow ET-ish, though that is not fault of the OVA alone. Other than that, the visuals are okay, about to be expected with the tighter budget of an OVA.
But hey, the cat was cute, so at least there's that.
