It looks like we’ll actually learn about the past of the other characters to a certain extent in this season. We got a brief glimpse of an unnamed woman whom we can only assume is somehow connected to Ichimoku Ren’s past. Ai is showing us different sides of her we haven’t seen previously. They seem to be trying to provide the character development that was pretty much missing from the first season. I think it’s just a matter of time before we get see an ongoing story once again. It’s almost certain that the mysterious little girl in the kimono will play a big part in it. Currently we still don’t know anything about her. The one shot stories for the first two episodes have been unique, so I actually wouldn’t mind them continuing the series in the same format for now.