...about a girl in need of money, then she recieved a message says if you want money you need to come to this certain place and do as i say. Then she came to the place to do some ecchi stuff and each day passed the ecchi stuff got crazier and in the end...

... she didn't recieve any money because the message was sent by herself in the past.

Please help guys. And thank you.

I just searched the net and found some clue that this hentai anime I'm looking for might already be deleted. I'm so sad but I think I managed to get some thumbnail pic, I will post the link below. Even though it may be deleted I just want to know the name because I think the story is pretty good and at least it will ease my soul. Thanks guys.

https://imgur.com/a/NUHNF

Another thumbnail:

https://imgur.com/a/cvKmN
https://imgur.com/a/BtJI7
https://imgur.com/a/eSE9t

Hot Damn!!
Finally I found it guys!
The title is Cosplay Roshutsu Kenkyuukai, and it hasn't disappeared from the net.
You should watch it guys!