This volume contains fuyukomi (Winter Comic Market) story and New Year story.
Haruka is like an incredibly smart puppy. You can teach her all kinds of tricks and she'll do them all perfectly. However, when it comes down to it, I *much* prefer Shiina. There's a short Shiina scene in the New Year story that really shows how emotionally strong Shiina is.
I think the series is maintaining entertainment value status quo. I did read through this volume, after all. Looks like the next volume will have an onsen story. What took him so long? ^^;