前作から5年半ぶりになるらしいです。月日が経つ早さに戦慄しますね！
1話と2話の間にオマケが1枚ありますが特に意味はありません。
あと今回から解像度を少し上げてみました。

1本目pixiv #15189913 »
2本目pixiv #17272424 »
3本目pixiv #28601681 »

それといつもの同じ内容の動画↓
http://www.nicovideo.jp/watch/sm32628195

It seems it's been about five and a half years since the last one of these. I tremble at how fast time flies!

There's one bonus image between parts 1 and 2, but it doesn't have any special meaning.

Also, from this part on, I've tried upping the image resolution a bit.

Part 1
Part 2
Part 3

And as always, there's a video with the same content.