These are various short stories and extras God Hand Mar has done for magazines and releases. Many of them did not come with clean, textless versions so I apologize for the weird typesetting on some.
Pages 4-6 were originally included the first volume of PuriMusu! but were more conveniently posted on pixiv: https://www.pixiv.net/member_illust.php?mode=medium&illust_id=53382039