So I opened the raw site of Akugyaku no Black Maria to look if it has new chapters, but I saw that it was gone now... What should I do now?
http://forum.novelupdates.com/threads/important-notice-for-readers-of-akugyaku-no-black-maria.29309/ I think you might have missed this post. It will have the answer.
There was a thread created by the translator about it yesterday or the day before. The author took it off. We don't know if it was licensed and will become a LN or he just gave up. We can only wait and see.
I don't believe it was the author who took the novel down, as his syosetu page has been terminated under violation of the ToS of Syosetu. From the author's page: このユーザは規約違反のため、運営により削除されました。 Basically says: "Because this user broke contract, it was deleted."
Wayback machine only gets about 200-ish chapters because the last snapshot of the page was back in July, so if you were already past 200, good luck because the nearly 200 other chapters are all irretrievable unless someone else can. On the bright side, there are still 7 of like 14 arcs, with like 20-ish chapters per arc(don't quote me on that).
If you want all chapters it is a little bit different: Just search for http://ncode.syosetu.com/n0287dd/ via google and load the link "in cache" after that copy the link of the chapter you want to read like http://ncode.syosetu.com/n0287dd/370/ and paste & search for it via google again. Now also load the link "in cache" and it`s done. thats it
For me it works fine (I think 371 chapters) but it`s better to save the chapters now Just search for the link of each chapter: ncode.syosetu.com/n0287dd/361/ ncode.syosetu.com/n0287dd/362/ ncode.syosetu.com/n0287dd/364/ and load the links in cache : http://webcache.googleusercontent.c...tu.com/n0287dd/361/+&cd=2&hl=de&ct=clnk&gl=de http://webcache.googleusercontent.c...tu.com/n0287dd/364/+&cd=8&hl=de&ct=clnk&gl=de
daym.. theyre too strict with their age restriction content.. I hope we get to know if the author move to another site to host his project or let it die like that .. ._.