 If you liked
Kurohime: Shikkoku no Yakata
|
 ...then you might like
Grope: Yami no naka no Kotori-tachi
|
The plots of the OVAs are quite different, but both are about a group of friends trapped in some kind of deadlock. Besides, in both situations the influence of the enclosed space is destructive, so the flow of the plot is somehow sad (nevertheless the endings do not match).