It' part 2+4: https://www.pixiv.net/member_illust.php?mode=medium&illust_id=39905339 https://www.pixiv.net/member_illust.php?mode=medium&illust_id=39906081
Part 1 and 3 here: https://www.pixiv.net/member_illust.php?mode=medium&illust_id=39904862 https://www.pixiv.net/member_illust.php?mode=medium&illust_id=39905767