As the blurb says, this standalone special features Miya Tachibana as the main character. As anybody that has watched Amagami SS knows, she does play a minor role in the series and is the classmate of Nakata Sae and Nanasaki Ai. I always enjoyed watching her interact with her brother Junichi and this special was a nice way to add more flesh to her character. If anything I would like to see her story made into a complete arc too.
As usual, artwork was soft and easy on the eye and each female protagonist from the Amagami SS series was briefly spotlighted as Miya tries to find out more about her brother and his interactions with girls. There is a lot of affection between the pair and the usual banter is present between the siblings as well as between Miya and those she interacts with.
Possibly the only real gripe I do have is: where does it fit into the overall story? my personal opinion is "somewhere inbetween" because as a standalone episode it works too.
The whole Amagami SS franchise was a very enjoyable watch and this makes a great addition to the experience. I just hope it is not the last we see of Miya though, she is a very likeable character and I expect Junichi will be very protective of her whenever she ventures out into the world of dating and male/female relationships.