Check it out here:
https://www.melonbooks.co.jp/detail/detail.php?product_id=1871250
and here:
https://ec.toranoana.jp/tora_r/ec/item/040031013637/

If you want to get the source of melonbooks files:
1.Install tempermonkey
2.Go to this site:https://greasyfork.org/en/scripts/451517-melonbooks%E5%9B%BE%E6%BA%90%E8%8E%B7%E5%8F%96/code then install it via Tempermonkey.
3.View the file in browser with the authorized account, there shall be a buttom on the right top, click on it to download the source pictures.
4.This might won't work as the site may upgrade its protection method. In this case, go to this person for help:
https://forums.e-hentai.org/index.php?showtopic=29160&st=120&p=5993381&#entry5993381

mlgb的为了这个玩意我先在淘宝请别人代接验证码，又发现国内银行卡也用不了，最后又喊人家帮忙买，前前后后花了104块，下载以后发现还是加密的.melon文件，给我气笑了。
如果有其他人碰到类似的加密文件问题也可以试试油猴Tempermonkey，很多时候有意想不到的好东西。
此外站内也有一个人做这方面破译的，可以去找他。详见：
https://forums.e-hentai.org/index.php?showtopic=29160&st=120&p=5993381&#entry5993381

真正的英雄！

Base +6, 凉拌嘟嘟莲 +3

戳了，强迫症嘛

Base +5

觉的复仇之旅啊（后面是前面数周前的事）

Base +6

别用网页截图了，Gayhub就有利用bug进行原档提取的方法：ironfistlovepunch/EditDotMelonFile

Base +2, PlasmatankActual +5

多谢帮忙！

Base +6